Source redundancy in cryptanalysis
= Source redundancy in cryptanalysis
For ciphertext alphabet $\Sigma$ and source entropy $H$, each symbol has redundancy $\log|\Sigma|-H$, leading in Shannon's ideal model to $U=\log|K|/(\log|\Sigma|-H)$.
= Source redundancy in cryptanalysis
For ciphertext alphabet $\Sigma$ and source entropy $H$, each symbol has redundancy $\log|\Sigma|-H$, leading in Shannon's ideal model to $U=\log|K|/(\log|\Sigma|-H)$.