Device and method for encrypting and decrypting a block of data
CA 2525591 C · Owner: Mediacrypt Ag · Inventors: Vaudenay, Serge; Junod, Pascal
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method to encrypt or decrypt blocks of data X to Y based on a main key R, this method using several serially connected modules each module using a sub-, key RA derived from the main key R and comprising the steps of: - inputting at least two initial values XOL and XOR, and mixing these values to form a mixed value X1, - obtaining a value X2 by mixing a first part RAH of the sub-key RA with the value X1, - obtaining a value X3 by applying the value X2 to a substitution layer, comprising at least one substitution box (sbox) - , obtaining a value X4 by using a diffusion box of multi-permutation type based on the value X3, - obtaining a value X5 by mixing a second part RAL of the subkey RA …
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 May 19, 2004 and granted October 9, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 19, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 19, 2026.
- 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.