"Use of the Signature Token to Create a Negotiable Document", by Donald W. Davies, Aug. 1983. |
"Digitalized Signatures and Public-Key Functions as Intractable as Factorization", by Michael O. Rabin, Jan. 1979. |
"A Fast Signature Scheme Based on Quadratic Inequalities", by Okamoto et al., IEEE, 1985. |
"The Knowledge Complexity of Interactive Proof-Systems," by Shafi Goldwasser, ACM, 1985. |
"Identity-Based Cryptosystems and Signature Schemes," by Adi Shamir, Dept. of Applied Mathematics, The Weizmann Institute of Science, Isreal. |