Glossary of Security Terms: Block Cipher Mode of Operation by@mozilla

Glossary of Security Terms: Block Cipher Mode of Operation

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Block ciphers are always used with a mode, which specifies how to securely encrypt messages that are longer than the block size. Using an inappropriate mode, or using a mode incorrectly, can completely undermine the security provided by the underlying cipher. Mozilla (stylized as moz://a) is a free software community founded in 1998 by members of Netscape. The size of each block is fixed and determined by the algorithm: for example AES uses 16-byte blocks. For example, AES is a cipher, while CTR, CBC, and GCM are all modes.

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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 AES uses 16-byte blocks. Block ciphers are always used with a mode, 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.

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by Mozilla Contributors @mozilla.Mozilla (stylized as moz://a) is a free software community founded in 1998 by members of Netscape.
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