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

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

Data Encryption Algorithm         
  • DES cracking machine]] contained 256,856 custom chips and could brute-force a DES key in a matter of days—the photo shows a DES Cracker circuit board fitted with several Deep Crack chips.
EARLY UNCLASSIFIED SYMMETRIC-KEY BLOCK CIPHER
DataEncryptionStandard; Data Encryption Algorithm; Data encryption standard; Single DES; DES (cryptography)
(DEA) An ANSI standard defined in ANSI X3.92-1981. It is identical to the Data Encryption Standard (DES). (1994-12-06)
Data Encryption Standard         
  • DES cracking machine]] contained 256,856 custom chips and could brute-force a DES key in a matter of days—the photo shows a DES Cracker circuit board fitted with several Deep Crack chips.
EARLY UNCLASSIFIED SYMMETRIC-KEY BLOCK CIPHER
DataEncryptionStandard; Data Encryption Algorithm; Data encryption standard; Single DES; DES (cryptography)
The Data Encryption Standard (DES ) is a symmetric-key algorithm for the encryption of digital data. Although its short key length of 56 bits makes it too insecure for modern applications, it has been highly influential in the advancement of cryptography.
Data Encryption Standard         
  • DES cracking machine]] contained 256,856 custom chips and could brute-force a DES key in a matter of days—the photo shows a DES Cracker circuit board fitted with several Deep Crack chips.
EARLY UNCLASSIFIED SYMMETRIC-KEY BLOCK CIPHER
DataEncryptionStandard; Data Encryption Algorithm; Data encryption standard; Single DES; DES (cryptography)
(DES) The NBS's popular, standard encryption algorithm. It is a product cipher that operates on 64-bit blocks of data, using a 56-bit key. It is defined in FIPS 46-1 (1988) (which supersedes FIPS 46 (1977)). DES is identical to the ANSI standard Data Encryption Algorithm (DEA) defined in ANSI X3.92-1981. DES has been implemented in VLSI. SunOS provides a des command which can make use of DES hardware if fitted. Neither the software nor the hardware are supposed to be distributed outside the USA. Unix manual pages: des(1), des(3), des(4). (1994-12-06)

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).