RC6 is a symmetric key block cipher based on the existing RC5. It was designed by Rivest, Sidney and Yin to meet the requirements of the AES competition. It is proprietary of RSA Security.
The algorithm was one of the finalists of the AES selection process, which finally picked Rijndael.
External links:
- http://www.rsasecurity.com/rsalabs/faq/3-6-4.html RSA Laboratories FAQ - What are RC5 and RC6?