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An Extended Lamport-Like One-Time Password Scheme and its Applications

We try to extend Lamport-like one-time password schemes. In this proposed method, it is possible to send arbitrary data from the client (prover) to the server (verifier) at the same time that the authentication is performed. This data is not prepared, and the user can freely select in each authentication phase. We assume using dedicated cryptographic hash functions such as SHA-2 (not the public-key cryptosystem), this means that we realize very efficient implementations.