Cryptographic system comprising a ciphering and deciphering system and a key escrow system and associated appliances and devices
CA 2280952 A1 · Owner: Stern, Jacques · Inventors: Naccache, David; Levy-Dit-Vehel, Francoise; Stern, Jacques
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a cryptographic system combining the so-called discrete logarithm and factoring principles comprising a ciphering and deciphering system and a key escrow system and the associated appliances and devices. It is particularly designed for being used in electronic systems such as chip cards PCMCIA cards, badges, contactless cards or any other portable medium.
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 February 17, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 17, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 17, 2020.
- 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.