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1. WO2003028281 - A CRYPTOSYSTEM FOR DATA SECURITY

Publication Number WO/2003/028281
Publication Date 03.04.2003
International Application No. PCT/CA2001/001429
International Filing Date 15.10.2001
Chapter 2 Demand Filed 23.04.2003
IPC
H04L 9/00 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
9Arrangements for secret or secure communication
CPC
H04L 9/0656
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
9Cryptographic mechanisms or cryptographic; arrangements for secret or secure communication
06the encryption apparatus using shift registers or memories for block-wise ; or stream; coding, e.g. DES systems ; or RC4; Hash functions; Pseudorandom sequence generators
065Encryption by serially and continuously modifying data stream elements, e.g. stream cipher systems, RC4, SEAL or A5/3
0656Pseudorandom key sequence combined element-for-element with data sequence, e.g. one-time-pad [OTP] or Vernam's cipher
H04L 9/0836
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
9Cryptographic mechanisms or cryptographic; arrangements for secret or secure communication
08Key distribution ; or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
0816Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
0819Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s)
083involving central third party, e.g. key distribution center [KDC] or trusted third party [TTP]
0833involving conference or group key
0836using tree structure or hierarchical structure
Applicants
  • 3927296 CANADA INC. [CA]/[CA] (AllExceptUS)
  • OOMMEN, John, B. [CA]/[CA] (UsOnly)
  • RUEDA, Luis [AR]/[CA] (UsOnly)
Inventors
  • OOMMEN, John, B.
  • RUEDA, Luis
Agents
  • MBM & CO.
Priority Data
2,358,04825.09.2001CA
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) A CRYPTOSYSTEM FOR DATA SECURITY
(FR) CRYPTOSYSTEME POUR SECURISER DES DONNEES
Abstract
(EN)
A method and device for creating ciphertext from plaintext, and for decoding ciphertext, utilizing a tree structure for both encoding and decoding, the tree having leaves which are associated with plaintext symbols and the branches having assigned thereto a member of the ciphertext alphabet so that when encoding, a traversal is made between the root and the leaf corresponding to the plaintext and recording the ciphertext associated with each branch traversed, and when decoding, using the ciperhtext to determine the branches to be traversed until a leaf is reached and recording the plaintext associated with that leaf.
(FR)
L'invention concerne un procédé et un dispositif pour créer un cryptogramme pour un texte en clair, ainsi que pour décoder un cryptogramme, en faisant appel à une structure arborescente à la fois pour le codage et le décodage. L'arborescence a des noeuds terminaux associés à des symboles du texte en clair et des branches auxquelles est alloué un élément de l'alphabet du cryptogramme de sorte que, lors du chiffrement, une traversée est effectuée entre la racine et le noeud terminal correspondant au texte en clair et enregistrant le cryptogramme associé à chaque branche traversée, et lors du déchiffrement, le cryptogramme sert à déterminer les branches à traverser pour atteindre un noeud terminal, le texte en clair associé à ce noeud terminal étant enregistré.
Also published as
IN190/MUMNP/2004
NO20041765
NZ532370
Latest bibliographic data on file with the International Bureau