Block cipher

nouncandidate·updated May 9, 2026

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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.

Framework senses

4 senses across 4 frameworks

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.