1. R. Rivest, A. Shamir and L. Adleman, “A Method for Obtaining Digital Signatures and Public-key Cryptosystems,” Commun. ACM 21, 2 (Feb. 1978), 120–126
2. H. Ong and C. P. Schnorr, “Signatures through Approximate Representations by Quadratic Forms,” Proceedings of Crypto 83, Santa Barbara, CA, August 21–24, 1983, to be published by Plenum Press.
3. H. Ong, C. P. Schnorr and A. Shamir, “An Efficient Signature Scheme Based on Quadratic Equations,” to appear Proceedings of 16th Symposium on Theory of Computing, Washington D.C., April 1984.
4. C. P. Schnorr, “A Cubic OSS-Signature Scheme,” private communication, May 1984.
5. S. Even, O. Goldreich and A. Lempel, “A Randomized Protocol for Signing Contracts,” in Advances in Cryptology, Proceedings of Crypto 82, Ed. by David Chaum, Ronald L. Rivest and Alan T. Sherman, Plenum Press, New York (1983).