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Permutation box

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.[1]

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 diffusion).

References

  1. Computer Science and Engineering. "Cryptography 2007" (PDF). Chalmers University of Technology. {{cite journal}}: Cite journal requires |journal= (help)


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