1. A user authentication scheme not requiring secrecy in the computer;Evans;Commun. Assoc. Comput. Mach.,1974
2. Cryptographic authentication of time-invariant quantities;Lennon;IEEE Trans. Commun.,1981
3. Password authentication with insecure communication;Lamport;Commun. Assoc. Comput. Mach.,1981
4. Passwords authentication using public-key encryption;Hwang,1983
5. A public key cryptosystem and a signature scheme based on discrete logarithms;ElGamal;IEEE Trans. Inf. Theory,1985