Re: VCRPLUS Huffman code
Has anyone worked out the VCRPLUS code?
It was partially broken a few years ago, and the results published in Cryptologia. I have a xerox in a carton somewhere. The break was for codes up to 4or 5 digits long, if I recall - this covers most of the major timeslots on the main stations. Longer codes cover odd timeslots on less popular stations. Code which implemented this partial crack was published on the net, and the VCR+ people got very upset about it - apparently they make money selling the codes to TV Guide and newspapers. It's protected as a trade secret, not a patent. It used a combination of lookup tables and Huffman codes, and included a certain amount of obfuscation to resist cracking. Peter Peter Trei Senior Software Engineer Purveyor Development Team Process Software Corporation http://www.process.com trei@process.com
On Tue, 5 Sep 1995, Peter Trei wrote:
Has anyone worked out the VCRPLUS code?
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Code which implemented this partial crack was published on the net, and the VCR+ people got very upset about it - apparently they make
I believe the code is in the cookbook archive at ftp.ee.ualberta.ca, but when I just tried to confirm I got timeouts. Brian ------------------------------------------------------------------------------ ftp.eskimo.com/blane | | www.eskimo.com/~blane ------------------------------------------------------------------------------
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Brian Lane -
Peter Trei