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:
Sep. 17, 2013
Filed:
Jun. 01, 2010
Brendan K. Bridgford, New Haven, CT (US);
Jason J. Moore, Albuquerque, NM (US);
Stephen M. Trimberger, San Jose, CA (US);
Eric E. Edwards, Albuquerque, NM (US);
Brendan K. Bridgford, New Haven, CT (US);
Jason J. Moore, Albuquerque, NM (US);
Stephen M. Trimberger, San Jose, CA (US);
Eric E. Edwards, Albuquerque, NM (US);
Xilinx, Inc., San Jose, CA (US);
Abstract
In one embodiment of the invention, a method is provided for protecting against attacks on security of a programmable integrated circuit (IC). At least a portion of an encrypted bitstream input to the programmable IC is decrypted with a cryptographic key stored in the programmable IC. A number of failures to decrypt the encrypted bitstream is tracked. The tracked number is stored in a memory of the programmable IC that retains the number across on-off power cycles of the programmable IC. In response to the number of failures exceeding a threshold, data that prevents the decryption key from being used for a subsequent decryption of a bitstream is stored in the programmable IC.