A few years ago I devised a symmetric-key system that worked like so: ...
I've read a lot of summaries of block ciphers particularly with regards to the NIST competitions stating that reduced-round block ciphers are, for example, vulnerable to differential cryptanalysis. I ...
AES has several different variants: AES-128 AES-192 AES-256 But why would someone prefer use one over another?
Why do we use a permutation table in the first step of DES algorithm and one at the end of algorithm?