SP-network
An SP-network, or substitution-permutation network, is a series
of linked mathematical operations used in block cipher algorithms
such as DES or AES.
These networks consist of S-boxes and P-boxes that transform blocks of
input bits into output bits. It is common for these
transformations to be operations that are efficient to perform in hardware, such as exclusive or.
S-boxes substitute or transform input bits into output bits. A good S-box will have the property
that changing one input bit will change about half of the output bits. It will
also have the property that each output bit will depend on every input bit.
P-boxes permute or transpose bits across S-box inputs.
Referenced By
Serpent encryption algorithm
|
