One way authentication
CA 2555322 C · Owner: Certicom Corp. · Inventors: Shannon-Vanstone, Sherry E.; Vanstone, Scott A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cryptosystem prevents replay attacks within existing authentication protocols, susceptible to such attacks but containing a random component without requiring modification to said protocols. The entity charged with authentication maintains a list of previously used bit patterns extracted , from a portion of the authentication message connected to the random component. If the bit pattern has been seen before the message is rejected; , if the bit pattern has not been seen before the bit pattern is added to the , stored list and the message is accepted.
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 14, 2005 and granted January 14, 2014. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 14, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.