Abstract
Formal specification and analysis of cryptographic protocols play an important role in evaluating cryptosystems. Thus, an efficient specification and analysis model for the protocols is strongly required. In this paper, we review the previous specification and analysis models of protocols and propose new Petri net based model, which is called CTPN (Cryptographic Timed Petri Net). Also, we suggest a new specification and analysis methodology for the protocols based on our proposed model. We define a CTPN-language for a CTPN-analyzer. A CTPN-analyzer is also developed for the systematic analysis of a protocol. Our CTPN model including CTPN-analyzer is found to have executable, formal, graphical textual, and consistent characteristics suitable for the specification and analysis of cryptographic protocols.
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