Input (grade 12): It was designed by Ron Rivest, Matt Robshaw, Ray Sidney, and Yiqun Lisa Yin to meet the requirements of the Advanced Encryption Standard (AES) competition.
Output (grade 9): It was designed by Ron Rivest, Matt Robshaw, Ray Sidney, and Yiqun Lisa Yin, and was also submitted to the NESSIE and CRYPTREC projects.