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. 10, 2012
Filed:
Jul. 28, 2006
Philippe M. T. Limondin, Cedar Rapids, IA (US);
T. Douglas Hiratzka, Coralville, IA (US);
Mark A. Bortz, Robins, IA (US);
Philippe M. T. Limondin, Cedar Rapids, IA (US);
T. Douglas Hiratzka, Coralville, IA (US);
Mark A. Bortz, Robins, IA (US);
Rockwell Collins, Inc., Cedar Rapids, IA (US);
Abstract
A method and apparatus for improved algorithm and key agility for a cryptosystem, comprising a CAM-type key manager. The key manager uses two memories, an index RAM and a key RAM, to virtualize each algorithm or key using pointers from the index RAM to the key RAM, allowing simple reference to algorithm/key pairs, and to dynamically allocate storage for keys. An autonomous free memory management design improves latency in future key write operations by transforming the search for free location addresses in the key RAM memory into a background task, and employing a free address stack. The index RAM is resizable so that data for a plurality of cryptographic algorithms may be stored dynamically.