byte transposition cipher - translation to ρωσικά
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byte transposition cipher - translation to ρωσικά

METHOD OF ENCRYPTION BY WHICH THE POSITIONS HELD BY UNITS OF PLAINTEXT (WHICH ARE COMMONLY CHARACTERS OR GROUPS OF CHARACTERS) ARE SHIFTED ACCORDING TO A REGULAR SYSTEM, SO THAT THE CIPHERTEXT CONSTITUTES A PERMUTATION OF THE PLAINTEXT
Transposition (cryptography); Columnar disposition; Transposition (cipher); Double transposition; Double transposition cipher; Transposition cryptography; Transposition ciphers; Double transportation cipher; Permutation cipher; Columnar transposition; Columnar transposition cipher; Myszkowski transposition

byte transposition cipher      
шифр перестановки байтов, шифр на основе перестановки байтов
double transposition         
  • '''Step 1:''' The plaintext message is written into the first grid (which has the key JANEAUSTEN).
  • The columns are read off in alphabetical order according to the key, into the next grid (see step 2).
  • '''Step 2:''' The columns from step 1 are written into the second grid (which has the key AEROPLANES).
  • The columns are read off in alphabetical order according to the key, into the next grid (see step 3).
  • '''Step 3:''' The ciphertext is often written out in blocks of 5, e.g. '''RIAES NNELI EEIRP''' etc.
двойная перестановка
transposition cipher         
  • '''Step 1:''' The plaintext message is written into the first grid (which has the key JANEAUSTEN).
  • The columns are read off in alphabetical order according to the key, into the next grid (see step 2).
  • '''Step 2:''' The columns from step 1 are written into the second grid (which has the key AEROPLANES).
  • The columns are read off in alphabetical order according to the key, into the next grid (see step 3).
  • '''Step 3:''' The ciphertext is often written out in blocks of 5, e.g. '''RIAES NNELI EEIRP''' etc.
шифр перестановки

Ορισμός

byte
<unit> /bi:t/ (B) A component in the machine data hierarchy larger than a bit and usually smaller than a word; now nearly always eight bits and the smallest addressable unit of storage. A byte typically holds one character. A byte may be 9 bits on 36-bit computers. Some older architectures used "byte" for quantities of 6 or 7 bits, and the PDP-10 and IBM 7030 supported "bytes" that were actually bit-fields of 1 to 36 (or 64) bits! These usages are now obsolete, and even 9-bit bytes have become rare in the general trend toward power-of-2 word sizes. The term was coined by Werner Buchholz in 1956 during the early design phase for the IBM Stretch computer. It was a mutation of the word "bite" intended to avoid confusion with "bit". In 1962 he described it as "a group of bits used to encode a character, or the number of bits transmitted in parallel to and from input-output units". The move to an 8-bit byte happened in late 1956, and this size was later adopted and promulgated as a standard by the System/360 operating system (announced April 1964). James S. Jones <jsjones@graceland.edu> adds: I am sure I read in a mid-1970's brochure by IBM that outlined the history of computers that BYTE was an acronym that stood for "Bit asYnchronous Transmission E..?" which related to width of the bus between the Stretch CPU and its CRT-memory (prior to Core). Terry Carr <bear@mich.com> says: In the early days IBM taught that a series of bits transferred together (like so many yoked oxen) formed a Binary Yoked Transfer Element (BYTE). [True origin? First 8-bit byte architecture?] See also nibble, octet. [Jargon File] (2003-09-21)

Βικιπαίδεια

Transposition cipher

In cryptography, a transposition cipher (also known as a permutation cipher) is a method of encryption which scrambles the positions of characters (transposition) without changing the characters themselves. Transposition ciphers reorder units of plaintext (typically characters or groups of characters) according to a regular system to produce a ciphertext which is a permutation of the plaintext. They differ from substitution ciphers, which do not change the position of units of plaintext but instead change the units themselves. Despite the difference between transposition and substitution operations, they are often combined, as in historical ciphers like the ADFGVX cipher or complex high-quality encryption methods like the modern Advanced Encryption Standard (AES).

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