Apparatus, system and method for detecting a loss of key stream synchronization in a communication system
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United States of America Patent
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Dec 1, 2009
Grant Date -
N/A
app pub date -
Feb 15, 2001
filing date -
Feb 15, 2001
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Abstract
An apparatus, system and method provides an out-of-synchronization detection by using a network layer checksum. A process operating at an upper layer verifies that a checksum embedded in a network layer header is correct before encrypting and transmitting a data packet containing the header and a payload. The data packet is received through a wireless communication channel at a receiver and decrypted. A calculated checksum is calculated on the received payload at the receiver and compared to the received checksum embedded in the header. A key stream used at the receiver for decrypting the received encrypted data packets is determined to be out of synchronization with a key stream used at the transmitter to encrypt the data packets if the calculated checksum is not equal to the network layer checksum.
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