| Vulnerabilities in the Adachi-Aoki-Komano-Ohta Micropayment Scheme Abstract (2005) | |||||||||||||||||
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| Rivest and Shamir presented two simple micropayment schemes, “PayWord ” and “MicroMint, ” for making small purchases over the Internet [14]. Recently, Adachi et al. have pointed out that the PayWord scheme has two security problems, and proposed a new micropayment scheme to overcome these problems [1]. Nevertheless, we show that their protocol is still vulnerable to impersonation and replay attacks. | |||||||||||||||||
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