Encryption system
CA 2064769 C · Owner: Cryptech, Inc. · Inventors: Wood, Michael C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The round number (R) is set to zero (100) then the round, number (R) is incremented by one (102). The plaintext data (104) is subjected to a variable permutation (106). An entry is selected from the permutation table memory (108) and a value is selected from the Mask table memory (110) to conduct the variable permutation (10b). Then a choice component (C) is equated with round number (R). Next a first variable key addition operation (114) is carried out on the data employing a key from the key table memory (116) and a value from the Mask table memory (110). In the next step (118) the, choice component (C) is see to a value one greater than the round number (R). The following step (120) …
Read the whole patent
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 March 14, 1990 and granted February 8, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 14, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 14, 2012.
- 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.