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

      In block ciphers based on substitution-permutation network, the P-boxes, together with the "substitution" S-boxes are used to make the relation between the plaintext and the ciphertext difficult to understand (see Shannon's Confusion and diffusion). P-boxes are typically classified as compression, expansion, and straight, depending on whether the number of output bits is less than, greater than, or equal to the number of input bits, respectively. Only straight P-boxes are invertible.


      See also


      Boolean function
      Nothing-up-my-sleeve number
      Substitution cipher


      References




      Sources


      Nayaka, Raja Jitendra; Biradar, R. C. (2013). 2013 Annual International Conference on Emerging Research Areas and 2013 International Conference on Microelectronics, Communications and Renewable Energy. IEEE. doi:10.1109/aicera-icmicr.2013.6575944.

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    Permutation & Combination - Package | PDF

    Permutation box - Alchetron, The Free Social Encyclopedia

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    Permutation Box | PDF

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    Permutation Box - Pathology

    1,692 Permutation Images, Stock Photos & Vectors | Shutterstock

    1,692 Permutation Images, Stock Photos & Vectors | Shutterstock

    Permutation - Calcworkshop

    Permutation - Calcworkshop

    Permutation And Combination Definition, Formulas, Examples, 40% OFF

    Permutation And Combination Definition, Formulas, Examples, 40% OFF

    Solved 5. Give an inverse permutation box for that | Chegg.com

    Solved 5. Give an inverse permutation box for that | Chegg.com

    General block diagram of permutation box | Download Scientific Diagram

    General block diagram of permutation box | Download Scientific Diagram

    General block diagram of permutation box | Download Scientific Diagram

    General block diagram of permutation box | Download Scientific Diagram

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    Permutation box - Wikipedia

    In cryptography, a permutation box (or P-box) is a method of bit-shuffling used to permute or transpose bits across S-boxes inputs, creating diffusion while transposing. [1] An example of a 64-bit "expansion" P-box which spreads the input S-boxes to as many output S-boxes as possible.

    What is p-box in Cryptography? - GeeksforGeeks

    Sep 20, 2023 · P-boxes are permutation boxes which are usually one of the main components of a modern block cipher. They are also known as D-boxes or diffusion boxes. P-boxes are used in the block cipher called the data encryption standard commonly known as DES in cryptography.

    Permutation box - Simple English Wikipedia, the free encyclopedia

    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.

    Data Encryption Standard - Online Tutorials Library

    The initial and final permutations are straight Permutation boxes (P-boxes) that are inverses of each other. They have no cryptography significance in DES. The initial and final permutations are shown as follows −

    Data encryption standard (DES) | Set 1 - GeeksforGeeks

    Sep 20, 2023 · In the first step, the 64-bit plain text block is handed over to an initial Permutation (IP) function. The initial permutation is performed on plain text. Next, the initial permutation (IP) produces two halves of the permuted block; saying Left …

    9.3 THE DES S-BOXES, P-BOX, AND INITIAL PERMUTATION (IP)

    9.3 the des s-boxes, p-box, and initial permutation (ip) Tables 9.4 to 9.11 specify the seven DES S-boxes, each with a 6-bit input ( x 0 , x 1 , x 2 , x 3 , x 4 , x 5 , x 6 ) and a 4-bit output ( y 0 , y 1 , y 2 , y 3 ); each table contains 4 rows and 15 columns, where

    DATA ENCRYPTION STANDARD - University of Missouri–St. Louis

    S-BOX. An S-Box(SUbstitution box) is an M*N susbtitution box where m and n are not necessarily same. each output bit is a boolean function function of the inputs. y1=f1(x 1,x 2,.....,x n) y2=f2(x 1,x 2,.....,x n) y3=f3(x 1,x 2,.....,x n) ..... ym=fm(x 1,x 2,.....,x n)-All the S-boxes should be non-linear

    Permutation - Formula, Definition, Examples, Permutations and ...

    Nov 25, 2024 · Permutation in mathematics is the arrangement of the object in a definite order. Permutation formula is given as npr = n!/(n-r)! Learn more about Permutation in this article by geeksforgeeks in detail

    encryption - How does Permutation and Substitution work?

    Jan 4, 2018 · I'm a little confused on how permutation and substitution works, I've been reading about S-DES and how it goes through P-Boxes and S-Boxes but what goes on inside P or S in the algorithm? Are these p and B boxes generated from the key?

    The exact difference between a permutation and a substitution

    Jul 16, 2019 · A “P-box” is a permutation of all the bits, meaning: it takes the outputs of all the S-boxes of one round, permutes the bits, and then feeds them into the S-boxes of the next round. A good P-box has the property that the output bits of any S-box are distributed to as many S-box inputs as possible.