Counterexample Generation for Ping-Pong Protocols Security Checking Algorithm

An improperly designed protocol for sending a message could be vulnerable to an active attacker. A protocol for sending a message is called secure if any attacker cannot obtain the original message. If a protocol is unsecure, an attacker may perform some operations to obtain the original message. Dolev et al. proposed an algorithm to check the security of ping-pong protocols using nondeterministic finite automata. In this paper, we propose an algorithm for generating counterexamples of unsecure protocols by storing the counterexamples using dynamic programming technique.