When a receiver of a cipher text message cannot decrypt the message due to the fact that he has lost his private-key, the private-key of the receiver and session-key of the message need to be recovered. In this paper, the authors design a new n-way key recovery system (n-KRS) that is characterized by a key encapsulation approach, n-way key recovery, secret designation of key recovery agents, fork and join of session-key with random keys, recovery request by a new key pair, certificate attaching scheme, component based software engineering and conformance to international standards. n-KRS is specified and analyzed by an extended cryptographic timed Petri net (ECTPN) model that is a new formal and graphical specification model for cryptographic protocols. Recoverability, performance characteristics of n-KRS are evaluated by means of a reachability graph of ECTPN. A prototype of n-KRS is developed and evaluated by means of a CC 2.0 based information security system evaluation scheme.
KSP Keywords
Agent technology, Component based software engineering(CBSE), Cryptographic protocol, Electronic Commerce, Fork and join, International standards, Key pair, Key recovery system, Petri net(PN), Random Key, Reachability Graph
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