Implicit certificate scheme with ca chaining
CA 2235359 C · Owner: Vanstone, Scott A. · Inventors: Vanstone, Scott A.; Qu, Minghua
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of generating a public key in a secure digital communication system having at least one trusted entity CA and subscriber entities A the method comprising the steps of: for each entity A the CA selecting a unique identity I A distinguishing the entity A; generating a public key reconstruction public data .gamma. A of entity A by mathematically combining a generator of the trusted party CA with a private value of the entity A such that the pair (I A, .gamma. A ) serves as A's implicit certificate; combining the implicit certificate information (I A .gamma. A) in accordance with a mathematical function F(.gamma. A I A) to derive an entity information .function.; generating a private …
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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 April 20, 1998 and granted April 10, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 20, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 20, 2020.
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Timeline
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Sources & verification
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.