Encryption apparatus, communication system using the same and method therefor
CA 2128115 C · Owner: Iwamura, Keiichi · Inventors: Iwamura, Keiichi; Yamamoto, Takahisa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In order to attain high speed and secure encryption a communication apparatus comprises a random number generation circuit for sequentially generating random number sequences which assure difficulty in terms of amount of calculation in cryptoanalyzing the sequences based on output sequences while using a cryptographic key shared by partner stations as an initial value and an encryption circuit for sequentially encrypting communication texts and outputting cryptograms in a transmitting station and sequentially cryptoanalyzing the cryptograms and outputting the same in a receiving station faster than the sequential generation of the random numbers by the random number generation circuit.
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 July 15, 1994 and granted August 10, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 15, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 15, 2016.
- 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.