1. Diffie, W., and Hellman, M. New directions in cryptography. IEEE Trans. on Inform. IT-22,6(Nov. 1976), 644–654.
2. Evans A., Kantrowitz, W., and Weiss, E. A user authentication system not requiring secrecy in the computer. Comm. ACM 17,8(Aug. 1974), 437–442.
3. Kohnfelder, L.M. Using certificates for key distribution in a public-key cryptosystem. Private communication.
4. Lipton, S.M., and Matyas, S.M. Making the digital signature legal-and safeguarded. Data Communications (Feb. 1978), 41–52.
5. McEliece, R.J. A public-key cryptosystem based on algebraic coding theory. DSN Progress Report, JPL, (Jan. and Feb. 1978), 42–44.