Usually means: Encryption method using fixed-size blocks.
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We found 4 dictionaries that define the word block cipher:

General (2 matching dictionaries)
  1. block cipher: Wiktionary
  2. Block cipher: Wikipedia, the Free Encyclopedia

Computing (2 matching dictionaries)
  1. block cipher: Hacking Lexicon
  2. block cipher: Encyclopedia

Definitions from Wiktionary (block cipher)

noun:  (cryptography) Any deterministic cipher that operates on fixed-size groups of bits (binary digits), called blocks, with an unvarying transformation specified by a symmetric key.

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