Pipelined packet encryption and decryption using counter mode with cipher-block chaining message authentication code protocol
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United States of America Patent
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Jun 22, 2010
Grant Date -
N/A
app pub date -
Oct 27, 2004
filing date -
Oct 27, 2004
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Abstract
An apparatus and corresponding method and computer program comprises a key mixing circuit to generate N groups of AES Blocks, each generated based upon a key, a transmitter MAC address, and a start value for a packet number. An input circuit receives N encrypted MPDUs, each comprising the transmitter address and one of N values for the packet number. Each of the N values for the packet number is greater than, or equal to, the start value for the packet number. A decryption circuit decrypts each of the N encrypted MPDUs using the respective one of the N groups of AES Output Blocks. The key mixing circuit generates each of the N groups of AES Output Blocks before the input circuit receives the respective one of the N encrypted MPDUs. The predetermined start value is initialized when the apparatus is initialized and incremented when each of the N groups of AES Output Blocks is generated.
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