abstract = "we present a general scheme for the design of block
ciphers by means of Genetic Programming. In this vein,
we try to evolve highly nonlinear and efficient
functions to be used for the key expansion and the
F-function of a Feistel network. Following this scheme,
we propose a new block cipher design called Wheedham,
that operates on 512 bit blocks and keys of 256 bits,
of which we offer its C code (directly translated from
the GP Trees) and some preliminary security results.",
notes = "WCCI 2006 - A joint meeting of the IEEE, the EPS, and
the IEE.