High Quality Content by WIKIPEDIA articles! Authenticated Encryption with Associated Data (AEAD) is a class of block cipher modes which encrypt (parts of) the message and authenticate the message simultaneously. Interest in these modes was sparked by the publication of Charanjit Jutla's IACBC and IAPM modes in 2000. As of 2005 this is an active area of cryptographic research. Examples of such modes include OCB mode, CCM mode, EAX mode, CWC mode and GCM mode. In cryptography, block ciphers are a symmetric encryption scheme where the same key is used for both encryption and decryption transformation. When using a block cipher for encryption, one must choose a mode of operation and sometimes a padding scheme. Since block ciphers operate on blocks of fixed length and messages may be of any length, the plain text must be padded to a multiple of the block cipher's block size and then partitioned into blocks of block size before encrypting each block using the chosen mode. The reverse operation of encryption is decryption and is usually a three step process: partition the cipher text into block size blocks, decrypt each block, and then remove the padding.

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