Modelling Fuzzy Universal Resource Identifiers: A First Approach (2008)
{ c.mitchell, g.y.psihoyios} @ apu.ac.uk Abstract: A Universal Resource Identifier (or URI) is a compact string of characters for identifying an abstract or physical resource, providing a simple and...
MODELLING E-BUSINESS SECURITY USING BUSINESS PROCESSES (2008)
Abstract: Organisations (enterprises, businesses, government institutions, etc.) have changed their way of doing business from a traditional approach to embrace e-business processes. This change...
Speech is one of the most fundamental forms of communication available to mankind. Because of its continuing importance in modern communication systems, protecting confidential conversations remains a
Challenges for Trusted Computing (2008)
S. Balfe, E. Gallery, C. J. Mitchell, K. G. Paterson, Royal Holloway
This article identifies and discusses some of the key challenges that need to be addressed if the vision of Trusted Computing is to become reality. Topics addressed include issues with setting up and...
A Comment on "Property of finite fields and its Cryptographic application" (2007)
Murphy And Mitchell, S. Murphy, C. J. Mitchell, Royal Holloway
The "new" property of finite fields given by Wei Baodian et al. is a well-known fundamental result in finite field theory.
Cryptanalysis of the EPBC authenticated encryption mode (2007)
Agenda - Introduction - Simultaneous confidentiality and integrity - Attacking EPBC - Completing the attack
The Cardspace Identity Management Framework (2007)
Introduction to CardSpace - The CardSpace architecture - Secure Interactions - Security and privacy issues - Possible solutions
Cryptanalysis of the EPBC authenticated encryption mode (2007)
Agenda - Introduction - Simultaneous confidentiality and integrity - Attacking EPBC - Completing the attack
The Cardspace Identity Management Framework (2007)
Introduction to CardSpace - The CardSpace architecture - Secure Interactions - Security and privacy issues - Possible solutions
ID-based cryptography using symmetric primitives (2007)
Mitchell, C. J., Piper, F. C., Wild, P. R.
A general method for deriving an identity-based public key cryptosystem from a one-way function is described. We construct both ID-based signature schemes and ID-based encryption schemes. We use a...
ID-based cryptography using symmetric primitives (2007)
Mitchell, C. J., Piper, F. C., Wild, P. R.
A general method for deriving an identity-based public key cryptosystem from a one-way function is described. We construct both ID-based signature schemes and ID-based encryption schemes. We use a...
Generic collision attacks on hash-functions and HMAC (2007)
Over the last two or three years there has been a huge amount of interest in hash-function specific collision attacks. In this talk we will consider a slightly different problem, namely the...
Generic collision attacks on hash-functions and HMAC (2007)
Over the last two or three years there has been a huge amount of interest in hash-function specific collision attacks. In this talk we will consider a slightly different problem, namely the...
This talk...Briefly introduces security terminology. Discusses a range of security problems arising in a pervasive and mobile computing environment. Also covers possible directions for solutions to...
This talk...Briefly introduces security terminology. Discusses a range of security problems arising in a pervasive and mobile computing environment. Also covers possible directions for solutions to...
Cryptanalysis of a hybrid authentication protocol for large mobile networks (2006)
In this paper we analyse a hybrid authentication protocol due to Chien and Jan, designed for use in large mobile networks. The proposed protocol consists of two sub-protocols, namely the intra-domain...
Cryptanalysis of a hybrid authentication protocol for large mobile networks (2006)
In this paper we analyse a hybrid authentication protocol due to Chien and Jan, designed for use in large mobile networks. The proposed protocol consists of two sub-protocols, namely the intra-domain...
Cryptanalysis of a hybrid authentication protocol for large mobile networks (2006)
In this paper we analyse a hybrid authentication protocol due to Chien and Jan, designed for use in large mobile networks. The proposed protocol consists of two sub-protocols, namely the intra-domain...
Mobile security and trusted computing (2006)
Some of the most significant security issues arising in the context of ubiquitous mobile computing are reviewed. Emerging technologies which may be able to help overcome these security problems are...
Mobile security and trusted computing (2006)
Some of the most significant security issues arising in the context of ubiquitous mobile computing are reviewed. Emerging technologies which may be able to help overcome these security problems are...
Mobile security and trusted computing (2006)
Some of the most significant security issues arising in the context of ubiquitous mobile computing are reviewed. Emerging technologies which may be able to help overcome these security problems are...
Cryptographic proofs of work (2005)
Unlike most talks in this series, this is not about completed research. Indeed, it is a review of existing work, and a list of unanswered questions, rather than a description of new results.
Cryptographic proofs of work (2005)
Unlike most talks in this series, this is not about completed research. Indeed, it is a review of existing work, and a list of unanswered questions, rather than a description of new results.
Developments in secure mobile systems (2005)
Work outlined in this presentation has been performed under the auspices of various research projects. Includes both collaborative (externally funded)research projects (including Mobile VCE Cores II...
Developments in secure mobile systems (2005)
Work outlined in this presentation has been performed under the auspices of various research projects. Includes both collaborative (externally funded)research projects (including Mobile VCE Cores II...
Comments on two anonymous conference key distribution systems (2005)
In this paper we consider the security of two recently proposed anonymous conference key distribution schemes. We show that neither scheme is as practical as the authors claim and that, in certain...
Cryptanalysis of two identification schemes based on an ID-based cryptosystem (2005)
Two identification schemes based on the Maurer-Yacobi ID-based cryptosystem are analysed and shown to suffer from serious security problems.
Comments on two anonymous conference key distribution systems (2005)
In this paper we consider the security of two recently proposed anonymous conference key distribution schemes. We show that neither scheme is as practical as the authors claim and that, in certain...
Cryptanalysis of two identification schemes based on an ID-based cryptosystem (2005)
Two identification schemes based on the Maurer-Yacobi ID-based cryptosystem are analysed and shown to suffer from serious security problems.
Comments on two anonymous conference key distribution systems (2005)
In this paper we consider the security of two recently proposed anonymous conference key distribution schemes. We show that neither scheme is as practical as the authors claim and that, in certain...
Cryptanalysis of two identification schemes based on an ID-based cryptosystem (2005)
Two identification schemes based on the Maurer-Yacobi ID-based cryptosystem are analysed and shown to suffer from serious security problems.
Security and privacy issues for future mobile systems (2005)
Security and privacy research topics of importance to future mobile systems are reviewed.
Security and privacy issues for future mobile systems (2005)
Security and privacy research topics of importance to future mobile systems are reviewed.
Partial key recovery attack against RMAC (2005)
Mitchell, C. J., Knudsen, L. R.
In this paper new “partial” key recovery attacks against the RMAC block cipher based Message Authentication Code scheme are described. That is we describe attacks that, in some cases, recover one...
Partial key recovery attack against RMAC (2005)
Mitchell, C. J., Knudsen, L. R.
In this paper new âpartialâ key recovery attacks against the RMAC block cipher based Message Authentication Code scheme are described. That is we describe attacks that, in some cases,...
Secure zero configuration in a ubiquitous computing environment (2005)
In this paper, we discuss the need for zero configuration in a ubiquitous environment. Security issues in ubiquitous environment are identified, and future research directions are outlined.
Partial key recovery attack against RMAC (2005)
Mitchell, C. J., Knudsen, L. R.
In this paper new “partial” key recovery attacks against the RMAC block cipher based Message Authentication Code scheme are described. That is we describe attacks that, in some cases, recover one...
Secure zero configuration in a ubiquitous computing environment (2005)
In this paper, we discuss the need for zero configuration in a ubiquitous environment. Security issues in ubiquitous environment are identified, and future research directions are outlined.
UK guidelines for the management of acute pancreatitis (2005)
Johnson, C.D., Charnley, R.B., Carter, R., Bassi, C., Chalmers, A., Imrie, C.W., ...
Dynamic content attacks on digital signatures (2005)
Digitally signing a digital document is a straightforward procedure; however, when the digital document contains dynamic content, the digital signature may remain valid but the viewed document may...
Dynamic content attacks on digital signatures (2005)
Digitally signing a digital document is a straightforward procedure; however, when the digital document contains dynamic content, the digital signature may remain valid but the viewed document may...
Dynamic content attacks on digital signatures (2005)
Digitally signing a digital document is a straightforward procedure; however, when the digital document contains dynamic content, the digital signature may remain valid but the viewed document may...
Matching key recovery mechanisms to business requirements (2004)
This paper addresses the business needs for key recovery as a counter-measure to the threat of losing potentially valuable information. Several requirements essential for a sound key recovery...
Matching key recovery mechanisms to business requirements (2004)
This paper addresses the business needs for key recovery as a counter-measure to the threat of losing potentially valuable information. Several requirements essential for a sound key recovery...
Matching key recovery mechanisms to business requirements (2004)
This paper addresses the business needs for key recovery as a counter-measure to the threat of losing potentially valuable information. Several requirements essential for a sound key recovery...
International standards for stream ciphers: a progress report (2004)
The main objective of this paper is to review the current status of stream cipher standardisation. The hope is that, by doing so, the algorithms and techniques that are likely to be standardised at...
International standards for stream ciphers: a progress report (2004)
The main objective of this paper is to review the current status of stream cipher standardisation. The hope is that, by doing so, the algorithms and techniques that are likely to be standardised at...
Comments on a cryptographic key assignment scheme (2004)
In this paper, we analyse the security of a cryptographic key assignment scheme, recently proposed by Huang and Chang, that is designed to provide time-constrained hierarchical access control. We...
Comments on a cryptographic key assignment scheme (2004)
In this paper, we analyse the security of a cryptographic key assignment scheme, recently proposed by Huang and Chang, that is designed to provide time-constrained hierarchical access control. We...
Comments on a cryptographic key assignment scheme (2004)
In this paper, we analyse the security of a cryptographic key assignment scheme, recently proposed by Huang and Chang, that is designed to provide time-constrained hierarchical access control. We...
Shim (2003) describes "unknown key-share" attacks on the two protocols, server-specific MAKEP and linear MAKEP, proposed by Wong and Chan (2001). In this letter, we point out an error in one of the...
Manual authentication for wireless devices (2004)
Mitchell, C. J., Gehrmann, C., Nyberg, K.
Manual authentication techniques have been designed to enable wireless devices to authenticate one another via an insecure wireless channel with the aid of a manual transfer of data between the...
Manual authentication for wireless devices (2004)
Mitchell, C. J., Gehrmann, C., Nyberg, K.
Manual authentication techniques have been designed to enable wireless devices to authenticate one another via an insecure wireless channel with the aid of a manual transfer of data between the...
Shim (2003) describes "unknown key-share" attacks on the two protocols, server-specific MAKEP and linear MAKEP, proposed by Wong and Chan (2001). In this letter, we point out an error in one of the...
Manual authentication for wireless devices (2004)
Mitchell, C. J., Gehrmann, C., Nyberg, K.
Manual authentication techniques have been designed to enable wireless devices to authenticate one another via an insecure wireless channel with the aid of a manual transfer of data between the...
Shim (2003) describes "unknown key-share" attacks on the two protocols, server-specific MAKEP and linear MAKEP, proposed by Wong and Chan (2001). In this letter, we point out an error in one of the...
Carpenter, L., Mitchell, C. J., Xu, Z. Z., Poronnik, P., Both, G. W., Biden, T. J.
The role of protein kinase C (PKC) in glucose-stimulated insulin secretion (GSIS) is controversial. Using recombinant adenoviruses for overexpression of PKCalpha and PKCdelta, in both wild-type (WT)...
Carpenter, L., Mitchell, C. J., Xu, Z. Z., Poronnik, P., Both, G. W., Biden, T. J.
The role of protein kinase C (PKC) in glucose-stimulated insulin secretion (GSIS) is controversial. Using recombinant adenoviruses for overexpression of PKCalpha and PKCdelta, in both wild-type (WT)...
A comment on "Property of finite fields and its Cryptographic application" (2003)
The ‘new’ property of finite fields given by Wei Baodian et al. is a well-known fundamental result in finite field theory.
A comment on "Property of finite fields and its Cryptographic application" (2003)
The ânewâ property of finite fields given by Wei Baodian et al. is a well-known fundamental result in finite field theory.
A comment on "Property of finite fields and its Cryptographic application" (2003)
The ‘new’ property of finite fields given by Wei Baodian et al. is a well-known fundamental result in finite field theory.
Truncation attacks on MACs (2003)
A new type of attack on message authentication codes (MACs) is introduced which takes advantage of possible weaknesses in interfaces to hardware security modules. In particular, if a module does not...
Truncation attacks on MACs (2003)
A new type of attack on message authentication codes (MACs) is introduced which takes advantage of possible weaknesses in interfaces to hardware security modules. In particular, if a module does not...
Truncation attacks on MACs (2003)
A new type of attack on message authentication codes (MACs) is introduced which takes advantage of possible weaknesses in interfaces to hardware security modules. In particular, if a module does not...
Analysis of 3gpp-MAC and two-key 3gpp-MAC (2003)
Mitchell, C. J., Knudsen, L. R.
Forgery and key-recovery attacks are described on the 3gpp-MAC scheme, proposed for inclusion in the 3gpp specification. Three main classes of attack are given, all of which operate whether or not...
Analysis of 3gpp-MAC and two-key 3gpp-MAC (2003)
Mitchell, C. J., Knudsen, L. R.
Forgery and key-recovery attacks are described on the 3gpp-MAC scheme, proposed for inclusion in the 3gpp specification. Three main classes of attack are given, all of which operate whether or not...
Analysis of 3gpp-MAC and two-key 3gpp-MAC (2003)
Mitchell, C. J., Knudsen, L. R.
Forgery and key-recovery attacks are described on the 3gpp-MAC scheme, proposed for inclusion in the 3gpp specification. Three main classes of attack are given, all of which operate whether or not...
A new key recovery attack on the ANSI retail MAC (2003)
A new type of attack is introduced which takes advantage of MAC truncation to simplify key recovery attacks based on MAC verifications. One example of the attack is described which, in certain...
A new key recovery attack on the ANSI retail MAC (2003)
A new type of attack is introduced which takes advantage of MAC truncation to simplify key recovery attacks based on MAC verifications. One example of the attack is described which, in certain...
A new key recovery attack on the ANSI retail MAC (2003)
A new type of attack is introduced which takes advantage of MAC truncation to simplify key recovery attacks based on MAC verifications. One example of the attack is described which, in certain...
Improvement of modified authenticated key agreement protocol (2002)
Mitchell, C. J., Hsu, C-L., Wu, T-S., Wu, T-C.
Recently, Ku and Wang showed that Tseng’s modified authenticated key agreement protocol is vulnerable to two attacks and proposed an improvement to withstand these attacks. However, this letter...
Improvement of modified authenticated key agreement protocol (2002)
Mitchell, C. J., Hsu, C-L., Wu, T-S., Wu, T-C.
Recently, Ku and Wang showed that Tsengâs modified authenticated key agreement protocol is vulnerable to two attacks and proposed an improvement to withstand these attacks. However, this letter...
Improvement of modified authenticated key agreement protocol (2002)
Mitchell, C. J., Hsu, C-L., Wu, T-S., Wu, T-C.
Recently, Ku and Wang showed that Tseng’s modified authenticated key agreement protocol is vulnerable to two attacks and proposed an improvement to withstand these attacks. However, this letter...
On the value of threshold signatures (2002)
Mitchell, C. J., Borselius, N., Wilson, A.
Threshold signature schemes are examples of threshold cryptosystems, as introduced by Desmedt, [4]. The purpose of this paper is to present a rather simple alternative to threshold signatures which...
On the value of threshold signatures (2002)
Mitchell, C. J., Borselius, N., Wilson, A.
Threshold signature schemes are examples of threshold cryptosystems, as introduced by Desmedt, [4]. The purpose of this paper is to present a rather simple alternative to threshold signatures which...
Safe payments on the net (2002)
The focus of this talk is security issues for e-commerce payments made across the internet. In other words this talk focuses on security issues for b2c (business to consumer) e-commerce. This is a...
Safe payments on the net (2002)
The focus of this talk is security issues for e-commerce payments made across the internet. In other words this talk focuses on security issues for b2c (business to consumer) e-commerce. This is a...
A pragmatic alternative to undetectable signatures (2002)
Mitchell, C. J., Borselius, N., Wilson, A.
A 'pragmatic' alternative to undetachable signatures is proposed. Undetachable signatures were introduced by Sander and Tschudin, [4], as a means of giving a mobile agent the means to sign a message...
A pragmatic alternative to undetectable signatures (2002)
Mitchell, C. J., Borselius, N., Wilson, A.
A 'pragmatic' alternative to undetachable signatures is proposed. Undetachable signatures were introduced by Sander and Tschudin, [4], as a means of giving a mobile agent the means to sign a message...
A Security Architecture for Agent-Based Mobile Systems (2002)
N. Borselius, N. Hur, M. Kaprynski, C. J. Mitchell, Royal Holloway
Future mobile systems are expected to exploit the flexibility of agent-based software in a variety of ways. This will include agents providing both middleware and application-level functionality....
This paper provides a review of the current state of the art in standards for Public Key Infrastructures. The main focus of the paper is the recent work by the Internet Engineering Task Force, ITU-T,...
This paper provides a review of the current state of the art in standards for Public Key Infrastructures. The main focus of the paper is the recent work by the Internet Engineering Task Force, ITU-T,...
Making serial number based authentication robust against loss of state (2000)
In this paper a novel method for making serial number based authentication protocols resilient against database failure is described. The method is applicable to the situation where a single server...
Making serial number based authentication robust against loss of state (2000)
In this paper a novel method for making serial number based authentication protocols resilient against database failure is described. The method is applicable to the situation where a single server...
An attack on Horng's identification scheme based on Shamir's modified RSA (2000)
In [1], Horng proposed an identification scheme based on Shamir's modified RSA ([2]). We show that the scheme is vulnerable to active attacks which enable the attacker to obtain the factorisation of...
An attack on Horng's identification scheme based on Shamir's modified RSA (2000)
In [1], Horng proposed an identification scheme based on Shamir's modified RSA ([2]). We show that the scheme is vulnerable to active attacks which enable the attacker to obtain the factorisation of...
Trialling Secure Billing with Trusted Third Party Support for UMTS Applications (1998)
G. Horn, P. Howard, K. M. Martin, C. J. Mitchell, B. Preneel, K. Rantos
We present a protocol developed by the ASPeCT project for secure billing that provides the incontestable charging that is required for UMTS. This protocol realises a payment system for value added...
Secure billing for mobile information services in UMTS (1998)
K M Martin, B Preneel, C J Mitchell, H J Hitz, G Horn, A Poliakova, ...
Abstract. This paper presents solutions developed in the ACTS ASPeCT project for advanced security features in UMTS. In particular, a secure billing scheme for value-added information services using...
Key Escrow in Mutually Mistrusting Domains (1996)
L. Chen, D. Gollmann, C. J. Mitchell
. In this paper we present a key escrow system which meets possible requirements for international key escrow, where different domains may not trust each other. In this system multiple third parties,...
Aperiodic and semi-periodic perfect maps (1995)
Paterson [1] has recently shown that the trivial necessary conditions are sufficient for the existence of a (binary) perfect map. These periodic structures can be transformed very simply into...
Aperiodic and semi-periodic perfect maps (1995)
Paterson [1] has recently shown that the trivial necessary conditions are sufficient for the existence of a (binary) perfect map. These periodic structures can be transformed very simply into...
Aperiodic and semi-periodic perfect maps (1995)
Paterson [1] has recently shown that the trivial necessary conditions are sufficient for the existence of a (binary) perfect map. These periodic structures can be transformed very simply into...
Parameter Selection for Server-Aided RSA Computation Schemes (1994)
The security, complexity, and application of two schemes for using an untrusted auxiliary processor to aid smart card RSA signature computations are reviewed, including detailed analysis of possible...
Parameter Selection for Server-Aided RSA Computation Schemes (1994)
The security, complexity, and application of two schemes for using an untrusted auxiliary processor to aid smart card RSA signature computations are reviewed, including detailed analysis of possible...
Parameter Selection for Server-Aided RSA Computation Schemes (1994)
The security, complexity, and application of two schemes for using an untrusted auxiliary processor to aid smart card RSA signature computations are reviewed, including detailed analysis of possible...
Modified forms of cipher block chaining (1991)
Mitchell, C. J., Varadharajan, V.
A long-standing proposal for modifying cipher block chaining to prevent data expansion is shown to be insecure in some circumstances. Different modifications are then presented which appear secure.
Modified forms of cipher block chaining (1991)
Mitchell, C. J., Varadharajan, V.
A long-standing proposal for modifying cipher block chaining to prevent data expansion is shown to be insecure in some circumstances. Different modifications are then presented which appear secure.
A security scheme for resource sharing over a network (1990)
The purpose of this paper is to describe a security scheme for a special purpose resource-sharing system for networked computers. The scheme makes use of cryptographic constructs called coupons,...
A security scheme for resource sharing over a network (1990)
The purpose of this paper is to describe a security scheme for a special purpose resource-sharing system for networked computers. The scheme makes use of cryptographic constructs called coupons,...
Limitations of challenge-response entity authentication (1989)
We consider two basic versions of the challenge-response authentication protocol, and exhibit both a method of attack and a simple modification preventing such attacks. We go on to consider three...
Limitations of challenge-response entity authentication (1989)
We consider two basic versions of the challenge-response authentication protocol, and exhibit both a method of attack and a simple modification preventing such attacks. We go on to consider three...
CCITT/ISO standards for secure message handling (1989)
Mitchell, C. J., Walker, M., Rush, P. D. C.
This paper examines some aspects of the security services in the CCITT Draft 1988 X.400 Recommendations for Message Handling Systems. A brief introduction to relevent cryptographic concepts is...
CCITT/ISO standards for secure message handling (1989)
Mitchell, C. J., Walker, M., Rush, P. D. C.
This paper examines some aspects of the security services in the CCITT Draft 1988 X.400 Recommendations for Message Handling Systems. A brief introduction to relevent cryptographic concepts is...
Algorithms for software implementations of RSE (1989)
Two new algorithms that facilitate the implementation of RSA in software are described. Both Algorithms are essentially concerned with performing modular arithmetic operations on very large numbers,...
Algorithms for software implementations of RSE (1989)
Two new algorithms that facilitate the implementation of RSA in software are described. Both Algorithms are essentially concerned with performing modular arithmetic operations on very large numbers,...
CCITT/ISO standards for secure message handling (1989)
Mitchell, C. J., Walker, M., Rush, P. D. C.
This paper examines some aspects of the security services in the CCITT Draft 1988 X.400 Recommendations for Message Handling Systems. A brief introduction to relevent cryptographic concepts is...
One-stage one-sided rearrangeable switching networks (1989)
We consider switching networks consisting of subscriber lines and crosswires connected by switches. A connection between two subscribers is made along one crosswire via two switches. We determine the...
One-stage one-sided rearrangeable switching networks (1989)
We consider switching networks consisting of subscriber lines and crosswires connected by switches. A connection between two subscribers is made along one crosswire via two switches. We determine the...
One-stage one-sided rearrangeable switching networks (1989)
We consider switching networks consisting of subscriber lines and crosswires connected by switches. A connection between two subscribers is made along one crosswire via two switches. We determine the...
Constructing new perfect binary arrays (1988)
Only a small number of different sizes are known for which there exist two-dimensional perfect binary arrays. Construction methods are given which generate new two-dimensional perfect binary arrays,...
Comment on 'Existence of one-dimensional perfect binary arrays' (1988)
A recent letter claims to prove that the only binary sequence has length four. The proof is not correct. The main result in Xians recent paper is the following theorem.
Constructing new perfect binary arrays (1988)
Only a small number of different sizes are known for which there exist two-dimensional perfect binary arrays. Construction methods are given which generate new two-dimensional perfect binary arrays,...
Comment on 'Existence of one-dimensional perfect binary arrays' (1988)
A recent letter claims to prove that the only binary sequence has length four. The proof is not correct. The main result in Xians recent paper is the following theorem.
Constructing new perfect binary arrays (1988)
Only a small number of different sizes are known for which there exist two-dimensional perfect binary arrays. Construction methods are given which generate new two-dimensional perfect binary arrays,...
Comment on 'Existence of one-dimensional perfect binary arrays' (1988)
A recent letter claims to prove that the only binary sequence has length four. The proof is not correct. The main result in Xians recent paper is the following theorem.
Switching networks for bidirectional telephone systems (1988)
We consider two-stage bidirectional switching networks which have a minimum of switches. Results on the structure of such networks in terms of the number of switches per crosswire are established.
Switch minimisation for a simple bidirectional network (1988)
The letter describes a method generating a one-stage, one-sided switching network with the minimum number of switches for any required level of connectivity. The fact that the method generates...
Switching networks for bidirectional telephone systems (1988)
We consider two-stage bidirectional switching networks which have a minimum of switches. Results on the structure of such networks in terms of the number of switches per crosswire are established.
Switch minimisation for a simple bidirectional network (1988)
The letter describes a method generating a one-stage, one-sided switching network with the minimum number of switches for any required level of connectivity. The fact that the method generates...
Switching networks for bidirectional telephone systems (1988)
We consider two-stage bidirectional switching networks which have a minimum of switches. Results on the structure of such networks in terms of the number of switches per crosswire are established.
Switch minimisation for a simple bidirectional network (1988)
The letter describes a method generating a one-stage, one-sided switching network with the minimum number of switches for any required level of connectivity. The fact that the method generates...
Switch reduction for bidirectional telephone systems (1987)
A method is described which, for any n, generates a rearrangeably nonblocking netowrk for a bidirectional telephone system containing 2n subscribers. The number of switches is always n2 + 2n - 1,...
Switch reduction for bidirectional telephone systems (1987)
A method is described which, for any n, generates a rearrangeably nonblocking netowrk for a bidirectional telephone system containing 2n subscribers. The number of switches is always n2 + 2n - 1,...
Switch reduction for bidirectional telephone systems (1987)
A method is described which, for any n, generates a rearrangeably nonblocking netowrk for a bidirectional telephone system containing 2n subscribers. The number of switches is always n2 + 2n - 1,...
A classification of time element speech scramblers (1985)
This paper contrasts four methods of time element speech scrambling (t.e.s), which remains an extremely important crytographic technique for narrow band channels, not least because of its robustness...
A classification of time element speech scramblers (1985)
This paper contrasts four methods of time element speech scrambling (t.e.s), which remains an extremely important crytographic technique for narrow band channels, not least because of its robustness...
A classification of time element speech scramblers (1985)
This paper contrasts four methods of time element speech scrambling (t.e.s), which remains an extremely important crytographic technique for narrow band channels, not least because of its robustness...
THE PROBLEM OF BACTERIURIA WITH INDWELLING URETHRAL CATHETERIZATION (1985)
SABANATHAN, K., CASTLEDEN, C. M., MITCHELL, C. J.
Bacteriuria following long-term catheterization is more likely to occur in elderly females over the age of 50 years, in patients with some abnormality of the bladder and when traumatic...
Group divisible designs with dual properties (1984)
Necessary and sufficient conditions are given for a square group divisible design to have a group divisible dual, and the structure of such designs is examined.
Group divisible designs with dual properties (1984)
Necessary and sufficient conditions are given for a square group divisible design to have a group divisible dual, and the structure of such designs is examined.
Group divisible designs with dual properties (1984)
Necessary and sufficient conditions are given for a square group divisible design to have a group divisible dual, and the structure of such designs is examined.
Mitchell, C. J., Bullock, Sarah, Ross, B. D.
The renal handling of gentamicin, neomycin and cephaloridine has been measured in the isolated perfused rat kidney. This model provides a sensitive indicator of renal function including tubular...
Typescript. Includes bibliographical references (leaves 316-324)
Detecting bunyaviruses of the Bunyamwera and California serogroups by a PCR technique.
Kuno, G, Mitchell, C J, Chang, G J, Smith, G C
Many bunyaviruses of the Bunyamwera and California serogroups are medically important human pathogens. The development of an effective technique to detect the viruses by using molecular biologic...
Chang, G J, Trent, D W, Vorndam, A V, Vergne, E, Kinney, R M, Mitchell, C J
We previously described a reverse transcriptase-PCR using flavivirus genus-conserved and virus species-specific amplimers (D. W. Trent and G. J. Chang, p. 355-371, in Y. Becker and C. Darai; ed.,...
Comparison of Sentinel and Bactec blood culture systems.
Stevens, M, Patel, H, Walters, A, Burch, K, Jay, A, Dowling, N, ...
AIMS: To evaluate the Sentinel automated blood culture system and to compare its performance with that of Bactec. METHODS: The Sentinel blood culture system was evaluated in three centres. The...
Constructing a database for low cost identification of gram negative rods in clinical laboratories.
Clayton, P, Feltham, R K, Mitchell, C J, Sneath, P H
A database was constructed for the routine identification of Enterobacteriaceae and Gram negative rods growing aerobically on MacConkey agar. The test methods were based primarily on multipoint...
Evaluation of Questor urine screening system for bacteriuria and pyuria.
Stevens, M, Mitchell, C J, Livsey, S A, MacDonald, C A
AIMS--To evaluate the Questor automated bacteriuria and pyuria screening system; to compare its performance with that of a reference method; and to assess its usefulness in a routine clinical...
Construction of a database to identify Staphylococcus species.
Geary, C, Stevens, M, Sneath, P H, Mitchell, C J
A database was constructed for the routine identification of Staphylococcus species, isolated from man. The method comprised 15 conventional characterisation tests using substrates incorporated into...
Gastric function and histology in chronic renal failure.
Mitchell, C J, Jewell, D P, Lewin, M R, McLaughlin, J E, Moorhead, J F
Gastric function and histology were investigated in 24 patients with untreated chronic renal failure. At endoscopy nine patients had oesophagitis, 12 patients were considered to have gastritis, and...
Prospective comparison of three non-invasive tests for pancreatic disease.
Foster, P N, Mitchell, C J, Robertson, D R, Hamilton, I, Irving, H, Kelleher, J, ...
Ultrasonography, computed tomography (CT), and an oral pancreatic function test were evaluated prospectively in 107 consecutive patients suspected of having pancreatic disease, the final diagnosis...
Preliminary evaluation of a single-day tubeless test of pancreatic function.
Mitchell, C J, Field, H P, Simpson, F G, Parkin, A, Kelleher, J, Losowsky, M S
The test for pancreatic exocrine function using N-benzoyl-L-tyrosyl-p-aminobenzoic acid (BTP test) does not require duodenal intubation, but misleadingly abnormal results often occur in patients with...
Clinical value of serum immunoreactive trypsin concentration.
Ruddell, W S, Mitchell, C J, Hamilton, I, Leek, J P, Kelleher, J
The clinical value of estimation of serum concentrations of immunoreactive trypsin was evaluated by studying 46 healthy controls, 23 controls in hospital, 44 patients with chronic pancreatic disease,...
Meningitis and endophthalmitis caused by Streptococcus suis type II (group R).
Agass, M J, Willoughby, C P, Bron, A J, Mitchell, C J, Mayon-White, R T
Diagnosis of abdominal masses with percutaneous biopsy guided by ultrasound.
Jaeger, H J, MacFie, J, Mitchell, C J, Couse, N, Wai, D
OBJECTIVE--To assess the accuracy and safety of percutaneous biopsy of abdominal masses guided by ultrasound. DESIGN--Prospective study. SETTING--Combined gastroenterology service, Scarborough...
Rational sequence of tests for pancreatic function.
Mitchell, C J, Elias, E, Agnew, J E, Summerfield, J, Dick, R
Of 144 patients with suspected pancreatic disease in whom a 75Se-selenomethionine scan was performed, endoscopic retrograde pancreatography (ERP) was successful in 108 (75%). The final diagnosis is...
Detecting bunyaviruses of the Bunyamwera and California serogroups by a PCR technique.
Kuno, G, Mitchell, C J, Chang, G J, Smith, G C
Many bunyaviruses of the Bunyamwera and California serogroups are medically important human pathogens. The development of an effective technique to detect the viruses by using molecular biologic...
Chang, G J, Trent, D W, Vorndam, A V, Vergne, E, Kinney, R M, Mitchell, C J
We previously described a reverse transcriptase-PCR using flavivirus genus-conserved and virus species-specific amplimers (D. W. Trent and G. J. Chang, p. 355-371, in Y. Becker and C. Darai; ed.,...
Comparison of Sentinel and Bactec blood culture systems.
Stevens, M, Patel, H, Walters, A, Burch, K, Jay, A, Dowling, N, ...
AIMS: To evaluate the Sentinel automated blood culture system and to compare its performance with that of Bactec. METHODS: The Sentinel blood culture system was evaluated in three centres. The...
Constructing a database for low cost identification of gram negative rods in clinical laboratories.
Clayton, P, Feltham, R K, Mitchell, C J, Sneath, P H
A database was constructed for the routine identification of Enterobacteriaceae and Gram negative rods growing aerobically on MacConkey agar. The test methods were based primarily on multipoint...
Evaluation of Questor urine screening system for bacteriuria and pyuria.
Stevens, M, Mitchell, C J, Livsey, S A, MacDonald, C A
AIMS--To evaluate the Questor automated bacteriuria and pyuria screening system; to compare its performance with that of a reference method; and to assess its usefulness in a routine clinical...
Construction of a database to identify Staphylococcus species.
Geary, C, Stevens, M, Sneath, P H, Mitchell, C J
A database was constructed for the routine identification of Staphylococcus species, isolated from man. The method comprised 15 conventional characterisation tests using substrates incorporated into...
Gastric function and histology in chronic renal failure.
Mitchell, C J, Jewell, D P, Lewin, M R, McLaughlin, J E, Moorhead, J F
Gastric function and histology were investigated in 24 patients with untreated chronic renal failure. At endoscopy nine patients had oesophagitis, 12 patients were considered to have gastritis, and...
Prospective comparison of three non-invasive tests for pancreatic disease.
Foster, P N, Mitchell, C J, Robertson, D R, Hamilton, I, Irving, H, Kelleher, J, ...
Ultrasonography, computed tomography (CT), and an oral pancreatic function test were evaluated prospectively in 107 consecutive patients suspected of having pancreatic disease, the final diagnosis...
Preliminary evaluation of a single-day tubeless test of pancreatic function.
Mitchell, C J, Field, H P, Simpson, F G, Parkin, A, Kelleher, J, Losowsky, M S
The test for pancreatic exocrine function using N-benzoyl-L-tyrosyl-p-aminobenzoic acid (BTP test) does not require duodenal intubation, but misleadingly abnormal results often occur in patients with...
Clinical value of serum immunoreactive trypsin concentration.
Ruddell, W S, Mitchell, C J, Hamilton, I, Leek, J P, Kelleher, J
The clinical value of estimation of serum concentrations of immunoreactive trypsin was evaluated by studying 46 healthy controls, 23 controls in hospital, 44 patients with chronic pancreatic disease,...
Meningitis and endophthalmitis caused by Streptococcus suis type II (group R).
Agass, M J, Willoughby, C P, Bron, A J, Mitchell, C J, Mayon-White, R T
Diagnosis of abdominal masses with percutaneous biopsy guided by ultrasound.
Jaeger, H J, MacFie, J, Mitchell, C J, Couse, N, Wai, D
OBJECTIVE--To assess the accuracy and safety of percutaneous biopsy of abdominal masses guided by ultrasound. DESIGN--Prospective study. SETTING--Combined gastroenterology service, Scarborough...
Rational sequence of tests for pancreatic function.
Mitchell, C J, Elias, E, Agnew, J E, Summerfield, J, Dick, R
Of 144 patients with suspected pancreatic disease in whom a 75Se-selenomethionine scan was performed, endoscopic retrograde pancreatography (ERP) was successful in 108 (75%). The final diagnosis is...
Clinical relevance of an unfused pancreatic duct system.
Mitchell, C J, Lintott, D J, Ruddell, W S, Losowsky, M S, Axon, A T
In man, the main pancreatic duct is normally derived from ventral and dorsal embryological buds of the pancreas. In a minority of people, failure of fusion of the two buds results in separate...
Cytosolic retinoic acid binding protein in the human pancreas.
Jutley, J K, Kelleher, J, Brennan, T G, Denyer, M E, Mitchell, C J
Cytosolic retinoic acid receptor in carcinoma, chronic pancreatitis, and normal pancreatic tissue were examined using sucrose density gradient centrifugation, isoelectric focussing on agarose gel and...
McNaught, C E, Woodcock, N P, MacFie, J, Mitchell, C J
Background: Bacterial translocation occurs in surgical patients and may predispose to postoperative septic morbidity. Many factors are thought to influence the prevalence of bacterial translocation,...
Infection with hepatitis B virus after open heart surgery.
Prentice, M. B., Flower, A. J., Morgan, G. M., Nicholson, K. G., Rana, B., Firmin, R. K., ...
Streptococcus suis type II (group R) as a cause of endophthalmitis.
McLendon, B F, Bron, A J, Mitchell, C J
A case is reported of a patient with bilateral endophthalmitis, meningitis, sensorineural deafness, labyrinthitis, and septicaemia due to Streptococcus suis type II (group R). The organism is known...
Safety of pancreatic surgery in a small DGH.
Millson, C. E., Mitchell, C. J., MacFie, J.
The Combined Gastroenterology Service at Scarborough Hospital has a particular interest in pancreatic disease. The claim that pancreatic surgery should only be performed in larger, specialised units...
Secure Billing for Mobile Information Services in UMTS
K.M. Martin, K Mmartin, B. Preneel, C.J. Mitchell, H.J. Hitz, G. Horn, ...
. This paper presents solutions developed in the ACTS ASPeCT project for advanced security features in UMTS. In particular, a secure billing scheme for value-added information services using...
Aedes albopictus in the United States: ten-year presence and public health implications.
Since its discovery in Houston, Texas, in 1987, the Asian "tiger mosquito" Aedes albopictus has spread to 678 counties in 25 states. This species, which readily colonizes container habitats in the...
West Nile virus isolates from mosquitoes in New York and New Jersey, 1999.
Nasci, R. S., White, D. J., Stirling, H., Oliver, J. A., Daniels, T. J., Falco, R. C., ...
An outbreak of encephalitis due to West Nile (WN) virus occurred in New York City and the surrounding areas during 1999. Mosquitoes were collected as part of a comprehensive surveillance program...
Seasonal infection of Culex mosquitos and swine with Japanese encephalitis virus
Okuno, T., Mitchell, C. J., Chen, P. S., Wang, J. S., Lin, S. Y.
A year-round study of the infection rates of JE virus in Culex mosquitos was made during 1970-71 in 2 hamlets in Taoyuan County, China (Province of Taiwan). JE virus was recovered from 5 of 314 pools...
Host-feeding patterns and behaviour of 4 Culex species in an endemic area of Japanese encephalitis
Mitchell, C. J., Chen, P. S., Boreham, P. F. L.
Studies were made on the host-feeding patterns and behaviour of 4 Culex species in China (Province of Taiwan) to further assess their importance as vectors of Japanese encephalitis. A relatively...
Ecological studies on the mosquito vectors of Japanese encephalitis
These studies were conducted in China (Province of Taiwan) to assess the populations of known and potential mosquito vectors of Japanese encephalitis in a typical endemic area, and to evaluate a...