substitution-permutation encryption - ορισμός. Τι είναι το substitution-permutation encryption
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Τι (ποιος) είναι substitution-permutation encryption - ορισμός

CIPHER DESIGN CONSTRUCTION
SP-network; Substitution-Permutation network; Substitution-permutation network; Permutation (Cryptography); Permutation (cryptography); Substitution–Permutation network

Cyclic permutation         
  • Matrix]] of <math>\pi</math>
TYPE OF (MATHEMATICAL) PERMUTATION WITH NO FIXED ELEMENT
Transposition (mathematics); Circular permutation; Adjacent transposition; Circular Permutation; Anticyclic permutation
In mathematics, and in particular in group theory, a cyclic permutation (or cycle) is a permutation of the elements of some set X which maps the elements of some subset S of X to each other in a cyclic fashion, while fixing (that is, mapping to themselves) all other elements of X. If S has k elements, the cycle is called a k-cycle.
Weierstrass substitution         
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TECHNIQUE TO INTEGRATE RATIONAL FUNCTIONS INVOLVING TRIGONOMETRIC FUNCTIONS.
Weierstraß substitution; Weierstrass substitution method; Weierstrass substitution formula; Weierstrass substitution formulas; Weierstrass' substitution; The Weierstrass Substitution; Weierstrass Substitution; The Weierstrass substitution; The tangent half-angle substitution; Tangent half angle substitution; Weierstrass substitution; Universal trigonometric substitution
In integral calculus, the Weierstrass substitution or tangent half-angle substitution is a method for evaluating integrals, which converts a rational function of trigonometric functions of x into an ordinary rational function of t by setting t = \tan (x /2).Weisstein, Eric W.
Substitution tiling         
TERM IN MATHEMATICS
Tile-substitution; Tile substitution
In geometry, a tile substitution is a method for constructing highly ordered tilings. Most importantly, some tile substitutions generate aperiodic tilings, which are tilings whose prototiles do not admit any tiling with translational symmetry.

Βικιπαίδεια

Substitution–permutation network

In cryptography, an SP-network, or substitution–permutation network (SPN), is a series of linked mathematical operations used in block cipher algorithms such as AES (Rijndael), 3-Way, Kalyna, Kuznyechik, PRESENT, SAFER, SHARK, and Square.

Such a network takes a block of the plaintext and the key as inputs, and applies several alternating rounds or layers of substitution boxes (S-boxes) and permutation boxes (P-boxes) to produce the ciphertext block. The S-boxes and P-boxes transform (sub-)blocks of input bits into output bits. It is common for these transformations to be operations that are efficient to perform in hardware, such as exclusive or (XOR) and bitwise rotation. The key is introduced in each round, usually in the form of "round keys" derived from it. (In some designs, the S-boxes themselves depend on the key.)

Decryption is done by simply reversing the process (using the inverses of the S-boxes and P-boxes and applying the round keys in reversed order).