block cipher
An encryption algorithm that breaks plain text into fixed-size segments and uses the same key to transform each plaintext segment into a fixed-size segment of cipher text. Examples: AES, Blowfish, DEA, IDEA, RC2, and SKIPJACK. (See: block, mode. Compare: stream cipher.)
Senses
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An encryption algorithm that breaks plain text into fixed-size segments and uses the same key to transform each plaintext segment into a fixed-size segment of cipher text. Examples: AES, Blowfish, DEA, IDEA, RC2, and SKIPJACK. (See: block, mode. Compare: stream cipher.)
Tutorial: A block cipher can be adapted to have a different external interface, such as that of a stream cipher, by using a mode of cryptographic operation to package the basic algorithm. (See: CBC, CCM, CFB, CMAC, CTR, DEA, ECB, OFB.)
- IETF RFC 4949 (Internet Security Glossary)Jan 06, 2026RFC 4949 — Internet Security Glossary (Version 2)https://www.rfc-editor.org/rfc/rfc4949.txtRFC 4949 is published by the IETF Trust and marked as "Distribution of this memo is unlimited". Verify IETF Trust copyright/licensing terms for reuse.Source: IETF RFC 4949 (rfc-editor.org).