Apparatus, system and method for detecting a loss of key stream system synchronization in a communication system

摘要

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.

主权项

1. A receiver comprising:
a processor; and computer-readable storage in communication with the processor, the computer-readable storage storing logical instructions that are executed by the processor to perform operations including:
receiving a data packet from a code stream at a sub-network security layer, the data packet containing a checksum and a payload, the checksum included in a header of the data packet,decrypting the data packet, using a forward cipher key,extracting the checksum from the header of the data packet,calculating a calculated checksum for the data packet,comparing the calculated checksum with the extracted checksum to determine an integrity of the data packet,resetting the code stream upon a determination that the integrity of the data packet is compromised, andtransmitting the data packet to a network layer upon a determination that the integrity of the data packet is not compromised.