DES Source code
PGP in a Nutshell
The Privacy Page
Miscellaneous Topics from Trinity College, Hartford Conn.
Vigenere Ciphers
Books on cryptography
Decorrelated Fast Cipher from Ecole Normale Superieure
Navy Cipher Archive
Toby's Cryptopage
Ron Rivest's Home Page
Alan Sherman's Home Page
Brooke Stephens' Home Page
Anagramming
Cryptographic Journals
...Cryptologia