Problems with Transposition ciphers

Transposition ciphers are vulnerable to chosen and known plaintext attacks. They work best on certain “lengths” of plaintext and they require relatively large amount of memory.
Substitution is done in S-boxes, transposition (or permutation) is done in P-boxes.

Transposition ciphers are vulnerable to chosen and known plaintext attacks. They work best on certain “lengths” of plaintext and they require relatively large amount of memory.