Block cipher
nounverified·updated May 9, 2026
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.
MWENISTIR 7298: Glossary of Key Information Security Terms, Revision 2
Senses
SANS Glossary of Security Terms
A block cipher encrypts one block of data at a time.
ISACA Cybersecurity Glossary
A public algorithm that operates on plaintext in blocks (strings or groups) of bits
Classifications
Entity Type
Capability72%llm-generatedllm:claude-haiku-4-5
?unassignedlast reviewed —
Sensitivity
unclassified
Information Class
unclassified
Variants
- plural
- Block ciphers
- possessive
- Block cipher's
- pluralpossessive
- Block ciphers'