- K. Matsuura and H. Imai. ``Inspection Mechanism for Server-and-Client Protocols with Private-Key Cipher''. The 4th International Conference on Ethical Issues of Information Technology, Rotterdam, Mar. 1998. (Full text (PDF))
- (Abstract) In an open network, how to provide deterrents to malicious behaviors is an important issue. A common solution is the use of cryptographic primitives. In this solution, execution logs are stored by each entity and used when needs arise for trouble settlement or judgment; authorities are involved mainly in the settlement phase. Depending on system-design and security policies, however, more active authorized procedures would be of great help. In preparation for such a situation, this paper introduces a framework of an inspection mechanism for server-and-client protocols which are based on a private-key cipher.
- The mechanism uses two ``current'' private keys per server-and-client pair. One of them is updated session by session and thus the system can accept one-session rental of the membership; voluntary clients can lend their membership to the inspection authority without disclosing the current keys of the next and future sessions. As an application example, a digital-valuable storage system called an ``electronic safe-deposit box'' is described and its protocol is shown in part.
- (Keywords) inspection mechanism, membership rental, key update, electronic safe-deposit box
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