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To: Tony Viola who wrote (83098)	6/8/1999 5:57:00 PM
From: greenspirit	Respond to of 186894

Tony and all, article...Secure compressed imaging (Assignee -- Intel Corporation) June 8, 1999 U.S. Patents via NewsEdge Corporation : Abstract: A secure method and apparatus for compressing and digitally signing compressed video data. The apparatus compresses video data and permits signing of the compressed video image in such a way that if only a portion of the video image is successfully transmitted, the digital signature corresponding to that portion can still be verified. An optimization scheme which allows the verification of portions of a successful digital transmission with using only one digital signature is also disclosed. Ex Claim Text: A system for verifying the authenticity of a compressed digital image, the system comprising: a communication link; a sending device coupled to the communication link, the sending device including a secure compressed signing device including (i) compression circuitry to compress a digital image to produce a compressed image, (ii) a partitioning circuit to partition the compressed image into a plurality of image sections, (iii) a hash circuit to hash each of the plurality of image sections and output a plurality of digests to be concatenated together to generate a hash sequence table, and (iv) a signing circuit to digitally sign said hash sequence table to produce a hash sequence table signature; and a receiving device configured to authenticate at least one image section of the plurality of image sections received in its entirety from the sending device by using the at least one image section, the hash sequence table signature, and the hash sequence table. Patent Number: 5907619 Issue Date: 1999 05 25