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 ?
The Hifn 7956 security processor is ideal for wireless applications with the acceleration of the Temporal Key Integrity Protocol (TKIP) and AES Counter Mode encryption with CBC-MAC Protocol (CCMP), and its high-speed LZS(R) compression engines to increase packet throughput.
11i Counter Mode with Cipher Block Chaining Message Authentication Code Protocol (CCMP) client in users' mobile devices, IT departments can ensure Common Criteria EAL4 and FIPS 140-2 compliance from the mobile users' handset to the access port to the wireless switch/controller.
The newly introduced IP core, JetCombo-3, features Advanced Encryption Standard (AES), Counter mode with CBC-MAC (AES-CCM), Galois-Counter Mode (AES-GCM), and XTS-AES mode (XEX-based Tweaked-codebook-mode with ciphertext-Stealing) all combined in the same IP core by sharing hardware resources.
The security engines in the Hifn processors accelerate a variety of IPsec, and SSL/TLS protocols including DES, Triple DES, AES (128, 192, and 256-bit, with counter mode support), MD5, SHA-1, true Random Number Generation, and Public Key.
The product line features Advanced Encryption Standard (AES), Counter mode with CBC-MAC (AES-CCM), Galois Counter Mode (AES-GCM), XEX-AES, Triple-DES, Secure Hashing cores, and multiple-standard combined cores.
The enterprise security processor also features packet filtering and flow processing, NAT, NAT-T, NAPT, IPSec and Secure Real-time Transport Protocol (SRTP) processing, as well as SHA-256, AES Galois Counter Mode (GCM), AES-XCBC-MAC-96, and Extended Sequence Numbers.

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