Efficient cryptographic hash functions and methods for amplifying the security of hash functions and pseudo-random functions
CA 2237941 C · Owner: Telcordia Technologies, Inc. · Inventors: Venkatesan, Ramarathnam; Aiello, William A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The cryptographic hash function circuit (300) has tables (301 302, ... 303) , and has inputs of ci(j) on the input buses (311 312,... 313) to the tables , (301, 302 ... 303) making outputs on the output buses (321 322, ... 323) , that feed into an exclusive-OR gate (331). The output of the exclusive-OR gate is kj on bus (351). The key K is the concatenation of the eight kj's.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed October 31, 1996 and granted February 27, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 31, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 31, 2018.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.