摘要：To access a network system legally, efficiently and securely, the authentication scheme is essential and very important. In this paper, we propose a nonce-based authentication scheme using smart card. We use Diffie- Hellmanschemetoenhancethesecurityof ourprotocol. Tolessenthecomputationload, theremotesystem alone proceeds the exponentiation computation and it also implements only once. The other computations are all concerned with simple one-way hash functions or exclusive-or operations. No verification table is needed in our protocol. The protocol provides not only mutual authentication between a user and the remote server but also achievement of key agreement. The protocol also supports convenient password update at the user’s terminal. To avoid the identity duplication, we introduce the idea of transformed identity in our protocol.
