1. B. O. Brachtl, D. Coppersmith, M. M. Hyden, S. M. Matyas, Jr., C. H. W. Meyer, J. Oseas, Sh. Pilpel, and M. Shilling. Data authentication using modification detection codes based on a public one way encryption function. U.S. Patent No. 4,908,861, issued March 13, 1990.
2. (Cf. C. H. Meyer and M. Shilling, Secure program load with modification detection code. In Securicom 88: 6ème Congrès mondial de la protection et de la sécurité informatique et des communications, pp. 111–130 (Paris, 1988).)
3. Lecture Notes in Computer Science;I Damgård,1988
4. S. Haber, W. S. Stornetta, How to time-stamp a digital document, Journal of Cryptography, Vol. 3, No. 2, pp. 99–111 (1991). (Presented at Crypto ’90.)
5. IEEE Computer Society;RC Merkle,1980