block cipher
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cipher that works on fixed-size blocks of bits
~35 min read
Encyclopedic overview
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In cryptography, a block cipher is a deterministic algorithm that operates on fixed-length groups of bits, called blocks. Block ciphers are the elementary building blocks of many cryptographic protocols. They are ubiquitous in the storage and exchange of data, where such data is secured and authenticated via encryption.
Excerpted from Wikipedia’s “block cipher” article, available under the CC BY-SA 4.0 licence.