CAST 128 Block Cipher  
   A text-file specification for CAST-128, a freely available 128-bit block cipher.
   ftp://ftp.isi.edu/in-notes/rfc2144.txt

Twofish  
   A freely available 128-bit block cipher designed by Counterpane Systems (Bruce Schneier et al.).
   http://www.counterpane.com/twofish.html

TEA - a Tiny Encryption Algorithm  
   TEA is a very small, efficient algorithm offering a moderate level of security
   ftp://ftp.cl.cam.ac.uk/papers/djw-rmn/djw-rmn-tea.html

IBM's MARS Block Cipher.  
   The company's AES proposal using 128 bit blocks. Contains descriptions, pseudocode and test vectors.
   http://www.research.ibm.com/security/mars.html

Serpent Block Cipher Homepage  
   Describes the 128-bit block cipher designed to replace DES. It was a finalist in the AES competition.
   http://www.cl.cam.ac.uk/~rja14/serpent.html

CSpears Ciphers Homepage  
   Contains cipher source code and technical explanations for SEAL, Skipjack and other well known ciphers.
   http://virtue.nu/cspears/cipher.html

Anubis Block Cipher web site  
   Describes the 128-bit variable-length key NESSIE candidate.
   http://planeta.terra.com.br/informatica/paulobarreto/AnubisPage.html

Khazad Block Cipher web site  
   Describes the 64-bit block cipher, 128-bit key NESSIE finalist.
   http://planeta.terra.com.br/informatica/paulobarreto/KhazadPage.html

JavaScript DES Implementation  
   The Data Encryption Standard, supporting ECB and CBC modes. Also has a function for Triple DES. Includes an explanation of how the program works and source code.
   http://www.shopable.co.uk/des.html

The CARACACHS Stream Cipher  
   Contains source code in C for this stream cipher which uses 160 to 2048-bit keys. Short keys are fast on 32-bit processors.
   http://membres.lycos.fr/caracachs/caracachs.htm

Konton2: A Stream Cipher  
   Konton2 is a stream cipher which does not resemble RC4 and does not use shift registers. The C source code for Konton2 is provided.
   http://www.geocities.com/da5id65536/

The Snow Stream Cipher  
   Describes the Snow stream cipher: both Snow 1.0 submitted to the NESSIE project and Snow 2.0. Snow is the work of Patrik Ekdahl and Thomas Johansson of the I.T. Dept. at Lund Univ., Sweden. The C source code for Snow is also provided.
   http://www.it.lth.se/cryptology/snow/

The Mugi Stream Cipher  
   Describes the MUGI stream cipher developed at Hitachi. MUGI is similar to, and based on, Panama. The link here is to the English home page of the MUGI site. Source code is not available at this site.
   http://www.sdl.hitachi.co.jp/crypto/mugi/index-e.html

QUALCOMM Australia's Home Page  
   Has information about QUALCOMM Australia's ciphers. In particular, links are provided to a "design paper" and source code for the "t class" of SOBER stream ciphers.
   http://people.qualcomm.com/ggr/QC/

Scream: A Software Efficient Stream Cipher  
   Describes the Scream stream cipher developed at IBM by Shai Halevi, Don Coppersmith, and Charanjit Jutla. Scream is based on SEAL. This is a .pdf file. Source code is not available here.
   http://eprint.iacr.org/2002/019.pdf

BMGL: Synchronous Key-stream Generator  
   Describes the BMGL stream cipher developed by Johan Hastad of the Royal Inst. of Technology and Mats Naslund of Ericsson Research in Sweden. BMGL, like Snow2, uses features of the Rijndael cipher. This is a PDF file. Source code is not available here.
   https://www.cosic.esat.kuleuven.ac.be/nessie/workshop/submissions/bmgl4.pdf

Camellia Home Page  
   Documents the Camellia block cipher jointly developed by NTT and Mitsubishi Electric in Japan in 2000. C source code is also provided.
   http://info.isl.ntt.co.jp/camellia/

ISAAC - a fast cryptographic random number generator  
   A stream cipher developed by Robert Jenkins. It was inspired by RC4.
   http://www.burtleburtle.net/bob/rand/isaacafa.html

SN3 Stream Cipher  
   SN3 is a stream cipher designed by Simeon Maltchev. Somewhat like ISAAC, it uses three constantly evolving blocks of state data which update each other. The C source code for SN3 is also provided.
   http://www.geocities.com/smaltchev/

FSAngo  
   FSAngo is a stream cipher developed by Fujisoft and Tokyo Denki University. It uses a Lehmer PRNG which is periodically rekeyed. Source code is not available at this site.
   http://www.fsi.co.jp/Cipher-HP_e/

AES Algorithm (Rijndael) Information  
   This is NIST's home page for the Rijndael block cipher, now the Advanced Encryption Standard (AES). It has links to the specification and source code.
   http://csrc.nist.gov/CryptoToolkit/aes/rijndael/

VMPC function and stream cipher  
   Describes the VMPC one-way function and a stream cipher based on it, designed by Bartosz Zoltak. Pseudo code and test-vectors are available here. The algorithm is similar to RC4 and VERY simple.
   http://www.vmpcfunction.com

Hiji Bij Bij  
   Describes a stream cipher devised by Palash Sarkar and the Cryptology Research Group at the India Statistical Institute. Like many new stream ciphers, it has two parts to its state, one part updated linearly and one part updated non-linearly. The linear p
   http://eprint.iacr.org/2003/014.ps

The Blowfish Encryption Algorithm  
   A freely available symmetric block cipher designed by Bruce Schneier as a drop-in replacement for DES or IDEA. Allows variable-length keys up to 448 bits.
   http://www.schneier.com/blowfish.html

Helix Stream Cipher  
   This PDF document describes the Helix stream cipher, devised by Niels Ferguson, Doug Whiting, Bruce Schneier, John Kelsey, Stefan Lucks, and Tadayoshi Kohno. The cipher produces a MAC for every plaintext it encrypts. Source code is not included in this do
   http://www.macfergus.com/helix/helix.pdf

CS2 Block Cipher  
   This PDF document describes to CS2 block cipher developed by Tom St Denis. CS2 is based on the CS cipher developed by Serge Vaudenay and takes advantage of work St Denis has done on the pseudo-Hadamard transform. Source code is not included, but test vect [PDF]
   http://eprint.iacr.org/2004/085.pdf

HC-256 Stream Cipher  
   HC-256 is a stream cipher developed by Hongjun Wu at the Institute for Infocomm Research in Singapore. It uses a very large state data set which it updates and reads from pseudo-randomly. It seems similar in basic design to SN3 and also borrows some ideas [PDF]
   http://eprint.iacr.org/2004/092.pdf

Rabbit Stream Cipher  
   The Rabbit stream cipher was developed by CRYPTICO A/S in Denmark. It runs in synchronous mode, uses a 128-bit key, and 513 bits of state data. This PDF file includes C source code for Rabbit.
   http://www.cryptico.com/Files/filer/rabbit_fse.pdf

RC6 Home at RSA  
   Block cipher proposed by RSA as an AES candidate.
   http://www.rsasecurity.com/rsalabs/node.asp?id=2512