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Title:
DATA PROCESSING SYSTEM FOR PROVIDING AUTHORIZATION KEYS
Document Type and Number:
WIPO Patent Application WO/2010/040629
Kind Code:
A3
Abstract:
The invention relates to a computer-implemented method for providing authorization keys (154; 156; 162; 164), wherein the method comprises the following steps: - Receiving a further asymmetrical, cryptographic key pair (162; 164), wherein the further asymmetrical key pair is part of a key pair sequence, wherein the further asymmetrical key pair comprises a further first (162) and a further second (164) authorization key, - retrieving a ciphertext (150), wherein the ciphertext is associated with the key pair (154; 156) which immediately precedes the further key pair (162; 164) in the sequence of key pairs, wherein the ciphertext (150) comprises the initial first key encrypted with the second authorization key (156) of the key pair which immediately precedes the further key pair in the sequence of key pairs, - decrypting the initial first authorization key using the first authorization key (154) of the key pair which immediately precedes the further key pair in the sequence of key pairs, - generating a further ciphertext (150) through encryption of the decrypted initial first authorization key using the second authorization key (164) of the further key pair, - saving the further ciphertext (150).

Inventors:
SPALKA ADRIAN (DE)
LEHNHARDT JAN (DE)
Application Number:
PCT/EP2009/062093
Publication Date:
April 21, 2011
Filing Date:
September 18, 2009
Export Citation:
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Assignee:
COMPUGROUP HOLDING AG (DE)
SPALKA ADRIAN (DE)
LEHNHARDT JAN (DE)
International Classes:
G06F21/34; G06Q50/00
Domestic Patent References:
WO2006029820A12006-03-23
Foreign References:
US20040172538A12004-09-02
Other References:
SCHNEIER B ED - SCHNEIER B: "APPLIED CRYPTOGRAPHY, PASSAGE", 1 January 1996, APPLIED CRYPTOGRAPHY, PROTOCOLS, ALGORITHMS, AND SOURCE CODE IN C, JOHN WILEY & SONS, INC, NEW YORK, PAGE(S) 173 - 175, ISBN: 978-0-471-11709-4, XP000864254
OWENS L ET AL: "An Identity Based Encryption System", PROCEEDINGS OF THE 3RD INTERNATIONAL SYMPOSIUM ON PRINCIPLES AND PRACTICE OF PROGRAMMING IN JAVA (PPPJ '04). LAS VEGAS, NEVADA, JUNE 16 20040616; 20040616 - 20040618, 16 June 2004 (2004-06-16), pages 154 - 159, XP040022545, ISBN: 978-1-59593-171-9
SCHNEIER, BRUCE: "Applied Cryptography", 1 January 1996, JOHN WILEY & SONS, INC, NEW YORk, pages: 52 - 53, XP002619016
Attorney, Agent or Firm:
RICHARDT, Markus et al. (Wilhelmstraße 7, Wiesbaden, DE)
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