Standards documentation
FIPS PUB 46-2:
Data Encryption Standard
FIPS PUB 74:
Guidelines for Implementing and using the NBS Data Encryption Standard.
FIPS PUB 81:
DES Modes of Operation.
FIPS PUB 180-1:
Secure Hash Standard
FIPS PUB 186:
Digital Signature Standard
RFC 1321:
MD5.