A block cipher mode of operation, usually just called a "mode" in context, specifies how a block cipher should be used to encrypt or decrypt messages that are longer than the block size. Most symmetric-key algorithms currently in use are block ciphers: this means that they encrypt data a block at a time. The size of each block is fixed and determined by the algorithm: for example uses 16-byte blocks. Block ciphers are always used with a , which specifies how to securely encrypt messages that are longer than the block size. For example, AES is a cipher, while CTR, CBC, and GCM are all modes. Using an inappropriate mode, or using a mode incorrectly, can completely undermine the security provided by the underlying cipher. AES mode View Previous Terms: Certificate authority Challenge-response authentication Cipher Cipher suite Ciphertext CORS CORS-safelisted request header CORS-safelisted response header Cross-site scripting Cryptanalysis Cryptographic hash function Cryptography CSP CSRF Decryption Digital certificate DTLS (Datagram Transport Layer Security) Encryption Forbidden header name Forbidden response header name Hash HMAC HPKP HSTS HTTPS Key MitM OWASP Preflight request Public-key cryptography Reporting directive Robots.txt Same-origin policy Session Hijacking SQL Injection Symmetric-key cryptography TOFU Transport Layer Security (TLS) Credits Source: https://developer.mozilla.org/en-US/docs/Glossary/Block_cipher_mode_of_operation Published under license Open CC Attribution ShareAlike 3.0

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Glossary of Security Terms: Block Cipher Mode of Operation

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