OCB Mode
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High Quality Content by WIKIPEDIA articles! OCB mode (Offset Codebook Mode) is a mode of operation for cryptographic block ciphers. It was designed to provide both authentication and privacy. It is essentially a scheme for integrating a Message Authentication Code (MAC) into the operation of a block cipher. In this way, OCB mode avoids the need to use two systems; a MAC for authentication and a block cipher encryption for privacy. This results in lower computational cost compared to the application of separate encryption and authentication functions.
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