counter mode


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Related to counter mode: Block cipher modes of operation

counter mode

In cryptography, a sophisticated mode of operation. Counter mode uses an arbitrary number (the counter) that changes with each block of text encrypted. The counter is encrypted with the cipher, and the result is XOR'd into ciphertext. Since the counter changes for each block, the problem of repeating ciphertext that results from the electronic code book (ECB) method is avoided. See mode of operation, block cipher, XOR and AES-CCMP.
References in periodicals archive ?
M., Resource Saving AES-CCMP Design with Hybrid Counter Mode Block Chaining--MAC, Int.
This is achieved by optimizing the power of the core cipher on which 128-EEA2 is based, that is, the Advanced Encryption Standard (AES) in counter mode. For that purpose, we introduce several power-efficient architectures and evaluate them in terms of area and power consumption.
The security engine in the 7956 accelerates a variety of IPsec and SSL/TLS protocols including DES, 3DES, AES (128, 192 and 256 bit with counter mode support), MD5, SHA-1, true random number generator and public key.

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