Abstract: Based on chaotic theory combined with one time password authentication technology, an identity authentication scheme was presented which can resist attacks in common and resolve ordinary one time password unresisting small number attack and insecurity problems of transmitting plaintext iteration times and easily finding the security leak of collisions in traditional Hash function. In this scheme, traditional Hash function was substituted with chaotic Hash function of more safety about confusion and diffusion, stranger resistant collision ability, and plaintext iteration times was substituted with scramble sort algorithm generated iteration times in network, so it is more safety.

Key words: identity authentication, chaotic Hash function, one time password