Permutation box facts for kids

An example of a 64-bit P-Box which spreads the input S-Boxes to as many out S-Boxes as possible.

In cryptography, a permutation box (or P-box) is a method of bit-shuffling used to permute or transpose bits (rearrange or swap the order of bits) across S-boxes inputs, maintaining diffusion while transposing.

In block ciphers, the S-boxes and P-Boxes are used to make the relation between the plaintext and the ciphertext difficult to understand (see Shannon's property of confusion).

Related pages

• S-box
• Substitution cipher

See also

In Spanish: Caja de permutación (criptografía) para niños