Task: Question Generation
Input (English): Context : Twofish was designed by Bruce Schneier, John Kelsey, Doug Whiting, David Wagner, Chris Hall, and Niels Ferguson; the ``extended Twofish team'' who met to perform further cryptanalysis of Twofish and other AES contest entrants included Stefan Lucks, Tadayoshi Kohno, and Mike Stay. 
Subject : Twofish 
Relation : based on
Output (English): Which is the basis of Twofish?