Vulnerabilities in the Adachi-Aoki-Komano-Ohta Micropayment Scheme

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.

• Type: Journal
• Year: 2007
• Where: IJNSEC
• Authors: Minho Kim, Çetin Kaya Koç
• Keywords: IJNSEC 2007, Micropayment Scheme, Simple Micropayment Schemes, Small Purchases