The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 09, 2007
Filed:
Dec. 16, 1999
Gerrit Roelofsen, Leiden, NL;
Dirk Jan Jacobus Van Bruchem, Wateringen, NL;
Frank Muller, Delft, NL;
Willem Rombaut, The Hague, NL;
Gerrit Roelofsen, Leiden, NL;
Dirk Jan Jacobus Van Bruchem, Wateringen, NL;
Frank Muller, Delft, NL;
Willem Rombaut, The Hague, NL;
Nokia Corporation, Espoo, FI;
Abstract
For cryptographically processing data, data (X) and a key (K) are fed to a cryptographic process (P), which may be a known process. In order to veil the nature of the process (P), auxiliary values as fed to the process, such as a supplementary key (K*), using which a supplementary process (P*) generates the key proper (K). The combination of the original process (P) and the supplementary process (P*) provides an unknown process, hence, the relationship between the supplementary key (K*) and the processed data (Y) is unknown. As a result, improved cryptographic security results.