[1] Federal Information Processing Standards Publication (FIPS PUB) 46-1, Data Encryption Standard, Reaffirmed 1988 January 22 (supersedes FIPS PUB 46, 1977 January 15). [2] ANSI X3.92-1981, American National Standard Data Encryption Algorithm, American National Standards Institute, Approved 30 December 1980. [3] Federal Information Processing Standards Publication (FIPS PUB) 81, DES Modes of Operation, 1980 December 2. [4] ANSI X3.106-1983, American National Standard for Information Systems - Data Encryption Algorithm - Modes of Operation, American National Standards Institute, Approved 16 May 1983. [5] ISO 8372, Information Processing Systems: Data Encipherment: Modes of Operation of a 64-bit Block Cipher. [6] ANSI X9.17-1985, American National Standard, Financial Institution Key Management (Wholesale), American Bankers Association, April 4, 1985, Section 7.2. [7] Voydock, V. L. and Kent, S. T., "Security Mechanisms in High- Level Network Protocols", ACM Computing Surveys, Vol. 15, No. 2, June 1983, pp. 135-171. [8] CCITT Recommendation X.509, "The Directory - Authentication Framework", November 1988, (Developed in collaboration, and technically aligned, with ISO 9594-8). [9] Kaliski, B., "The MD2 Message-Digest Algorithm", RFC 1319, RSA Laboratories, April 1992. [10] Rivest, R., "The MD5 Message-Digest Algorithm", RFC 1321, MIT Laboratory for Computer Science and RSA Data Security, Inc., April 1992. [11] PKCS #1: RSA Encryption Standard, Version 1.4, RSA Data Security, Inc., June 3, 1991. [12] Linn, J., "Privacy Enhancement for Internet Electronic Mail: Part I: Message Encryption and Authentication Procedures", RFC 1421, DEC, February 1993. [13] Kent, S., "Privacy Enhancement for Internet Electronic Mail: Part II: Certificate-Based Key Management", RFC 1422, BBN, February 1993. [14] Kaliski, B., "Privacy Enhancement for Internet Electronic Mail: Part IV: Key Certification and Related Services", RFC 1424, RSA Laboratories, February 1993.