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Block cipher

nounid 1686·updated May 9, 2026
candidate

A symmetric key cryptographic algorithm that transforms a block of information at a time using a cryptographic key. For a block cipher algorithm, the length of the input block is the same as the length of the output block.

MWE

Classifications

Entity Type

Capability72%llm-generatedllm:claude-haiku-4-5

Sensitivity

unclassified

Information Class

unclassified

Variants

plural
Block ciphers
possessive
Block cipher's
pluralpossessive
Block ciphers'

Framework definitions

SANS Glossary of Security Terms1 senseview framework →
§1
A block cipher encrypts one block of data at a time.
ISACA Cybersecurity Glossary1 senseview framework →
§1
A public algorithm that operates on plaintext in blocks (strings or groups) of bits
NISTIR 7298: Glossary of Key Information Security Terms, Revision 21 senseview framework →
§1
A symmetric key cryptographic algorithm that transforms a block of information at a time using a cryptographic key. For a block cipher algorithm, the length of the input block is the same as the length of the output block.
NIST SP 800-901 senseview framework →
§1
A symmetric key cryptographic algorithm that transforms a block of information at a time using a cryptographic key. For a block cipher algorithm, the length of the input block is the same as the length of the output block.

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Incoming relationships

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