A cryptographic communications method and system
CA 2133200 C · Owner: Zuk, Edward Andrew · Inventors: Zuk, Edward Andrew
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for loading secret data, such as an application key on a smart card (6), which involves storing a random key on the card (6), encrypting the random key on the basis of a public key and providing the encrypted random key to a central processing station (4). The encrypted random key is decrypted at the central station on the basis of a secret key and the station (4), encrypts data on the basis of the random key and transmits it to the smart card (6). The smart card decrypts the encrypted data on the basis of the random key. The random key can be generated internally and stored on read protected memory (23) of the card (6). The public key encrypting and secret key decrypting steps may …
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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 March 30, 1993 and granted August 11, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 30, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 30, 2015.
- 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.