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:
Aug. 18, 2015
Filed:
Jul. 02, 2007
Thomas Tkacik, Austin, TX (US);
Amir K. Daneshbeh, Austin, TX (US);
Thomas Tkacik, Austin, TX (US);
Amir K. Daneshbeh, Austin, TX (US);
FREESCALE SEMICONDUCTOR, INC., Austin, TX (US);
Abstract
An asymmetric cryptographic integrated circuitand a data processing devicein which the integrated circuitis used are disclosed. A security boundaryis confined to the interior of integrated circuit. A random number generatorwith a hardware entropy sourceand an arithmetic unitprogrammed through microcodeto perform a variety of cryptographically useful functions are included within security boundary. One of these functions is a primality tester. A controllerfor integrated circuitmay cause cryptographically sensitive data, such as large random prime numbers and a clear private key to be generated within the confines of security boundary. A symmetric key encryption engineis included within security boundaryand used to encrypt the clear private key so that a resulting encrypted private key may be stored outside security boundaryin a non-volatile memory