Cryptography Programs

Description	URL	Author
A tutorial on the Data Encryption Standard	des	Mathew Fischer
An implementation of DES in C (incomplete: lacks the ability to bufferthe input)	des.c	Greg Miller
An inplementation of RSA in 4 lines of Perl	rsa_n_4	Adam Back
An expanded, commented version of the above	rsan4exp.txt	Adam Back
Original post on how to use rsa_n_4	rsan4pst.txt	Adam Back
An implementation of RC4 in 4 lines of Perl	rc4.txt	Adam Back
A tutorial on the IDEA encryption algorithm	idea.zip
An implementation of the IDEA encryption algorithm	idea22a.zip
A paper on cracking PKZIP's encryption algorithm	zipcrack.zip	Eli Biham and Paul C. Koucher
A program for cracking PKZIP files	pkzcrack.zip
The original PKZIP encryption contest	contest.zip
A tutorial on the Lucifer encryption algorithm	luc.zip
The S1 cipher posted in sci.crypt (supposedly the encryption algorithm used by the Clipper Chip: SKIPJACK)	s1.c	Anonymous
A post from sci.crypt.research describing an attack on S1	s1crack.txt	David Wagner
A program which breaks Netscape's weakly generated SSL keys	unssl.c	Ian Goldberg and David Wagner
Blowfish implemented in C	blowfish.c	Bruce Schneier
A program for analyzing character frequency in text	boucher-chi-square.c	Peter K. Boucher
An ethernet packet sniffer (requires promiscuous mode)	gobbler.zip