Modifying check codes in data packet transmission

Details Modifying check codes in data packet transmission Modifying check codes in data packet transmission

1992-01-13

1993-10-05

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 99, 371 371, 371 377, 371 381, 371 391, 371 44, 341 94, G06F 1108

Patent

active

052512150

ABSTRACT:
Disclosed is a method and circuit for modifying the check code of a data packet based on a first seed to accommodate the addition or substraction of a header. A number of bits, which include a second seed, an exclusive OR function of the first seed and a portion of a header, and a string of zeros dependent upon the length of an incoming data packet, is sent through a CRC generator. The resulting CRC calculation and the incoming packet check code are exclusive ORed to produce a modified check code taking into account the addition or substraction of the header.

REFERENCES:
patent: 3872430 (1975-03-01), Boudreau et al.
patent: 4577313 (1986-03-01), Sy
patent: 4720830 (1988-01-01), Joshi et al.
patent: 5121396 (1992-06-01), Irvin et al.
D. R. Irvin, "Preserving the Integrity of Cyclic-Redundancy Checks When Protected Text is Intentionally Altered," IBM J. Res. Develop., vol. 33, No. 6 (Nov. 1989), pp. 618-626.

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