Deciphering of fragmented enciphered data packets

Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Protection at a particular protocol layer

Reexamination Certificate

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Reexamination Certificate

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07818564

ABSTRACT:
The deciphering of fragmented enciphered IP packets is performed without requiring reassembly of the fragments. fragmented packets. When a first frame is deciphered a characteristic poly-tuple is saved against the state of the cipher, particularly an output vector. When the next frame comes in, the cipher would continue on from that previously saved state after a look-up of the poly-tuple. Each frame would then be sent on, deciphered, but still representing a fragment of the original packet. The poly-tuple employed for the look-up includes the identity and protocol fields from the IP header and at least one of the source IP address and the destination IP address. The deciphering process may commence with the combination of input data with an initializing vector and proceed by combining input data with a vector fed back from the output of the deciphering engine. The saved cipher state is employed as the initializing vector for the next frame.

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Search Report for Application No. GB 0505938.1, Jul. 7, 2005.

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