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Expired Canadian patentCanada

Scheme for fast realization of encryption, decryption and authentication

CA 2267721 C · Owner: Naito, Shozo · Inventors: Naito, Shozo; Takagi, Tsuyoshi

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Abstract From the Canadian patent

A new scheme for fast realization of encryption decryption and authentication which can overcome the problems of the RSA cryptosystem is disclosed. The encryption obtains a ciphertext C from a plaintext M according to C ~ M e (mod n) using a first secret key given by N (~ 2) prime numbers p1, p2, ~, p N a first public, key n given by a product p1 k1p2 k2 ~ p N kN where k1 k2, ~, kN are arbitrary positive integers a second public key a, and a second secret key d which satisfy ed ~ 1 (mod L) where L is a least common multiple of p1-1 p2-1, ~, pN-1. The decryption recovers the plaintext M by obtaining residues M p1k1, M p2k2, ~, M pNkN modulo p1k1 p2k2, ~, p NkN, respectively, of the plaintext …

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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 24, 1999 and granted July 30, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 24, 2019.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 24, 2021.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 24, 1999
GrantedJuly 30, 2002
Term endedMarch 24, 2019
Patent numberCA 2267721 C
Classification (IPC)H04L9/30 +2 more

Timeline

Timeline From CIPO dates

2000200220042006200820102012201420162018Application filedMarch 24, 1999Patent grantedJuly 30, 2002Term endedMarch 24, 2019

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.