Detection of signatures in disordered message segments

Details Detection of signatures in disordered message segments Detection of signatures in disordered message segments

2011-06-07

2011-06-07

Ryman, Daniel J (Department: 2466)

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

C726S023000

Reexamination Certificate

active

07957390

ABSTRACT:
A method of detecting signatures in message segments comprises employing a state machine for the detection of character strings in the message segments. The state machine executes for each input character a transition determined by a current state of the machine and a current input character. The message segments conform to TCP or other ordering transport protocol. The order of arrival of the message segments is monitored. In the event that an intermediate message segment is missing between a processed segment and an immediately subsequent message segment, the current state of said state machine at the end of the said processed segment is stored. The machine is restarted from its null or datum state for the examination of the immediately subsequent message segment, which is then temporarily stored. When the missing segment eventually arrives, it and the stored segment are successively examined for signatures by means of the state machine, beginning at the stored state. The invention allows for examination of overlapping signatures without requiring re-assembly of the segments or substantial buffering.

REFERENCES:
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patent: 2005/0025152 (2005-02-01), Georgiou et al.
patent: 2006/0077979 (2006-04-01), Dubrovsky et al.
patent: 2006/0224589 (2006-10-01), Rowney et al.
patent: WO 02/101516 (2002-12-01), None
Search Report from counterpart GB application No. 0507143.6.

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