Methods and circuits for protecting proprietary configuration data for programmable logic devices

No: 7373668
Nr. solicitare: 10147600
Data depunerii: 2002-05-17
Data eliberarii: 2008-05-13
Tip: B1
Revendicari: 15
Schite: 14
Rezumat: Described are methods and systems for encrypting and decrypting configuration data for programmable logic devices. An encrypted bitstream of configuration data includes two or more portions, each of which may be encrypted using a different key. Prior to loading, the author of each portion calculates the byte count for his or her portion and loads the required decryption key and byte count into a key and count memory. The designs are then loaded together as a single bitstream. The PLD decrypts the first portions using the first password. At the start of the partial bitstream, configuration logic loads the count associated with the decryption key for the first portions into a decrementing counter. The counter then decrements for each byte decrypted, reaching a count of zero when the first portion is fully decrypted. The configuration logic then selects the subsequent decryption key and associated count for the next portion of the bitstream.
Clase SUA:
	No:713 - Electrical computers and digital processing systems: support  / No:191 - Upgrade/install encryption
	No:713 - Electrical computers and digital processing systems: support  / No:193 - By stored data protection
Inventatori:
	Trimberger Stephen M.  (54)
Examinator principal: Sheikh Ayaz
Examinator secundar: Moorthy Aravind K
Mandatari:
	Behiel Arthur J.  (84)
	Maunu LeRoy D.  (195)
Cesionari:
	XILINX, Inc.} (ORG)  (40)
Domeniu de cautare:
Documente externe:
	0253530 / 1987-05-31
	2424557 / 2006-08-31 / United Kingdom
	WO92/20157 / 1992-10-31
	WO94/10754 / 1993-10-31
	WO94/01867 / 1993-12-31
	WO9946774 / 1999-08-31
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	U.S. Appl. No. 10/147,664 filed May 17, 2002, Trimberger, Stephen M., entitled “Methods and Systems for Encrypting Proprietary Configuration Data for Programmable Logic Devices”, Xilinx, Inc., San Jose, CA 95124 (66 pgs).
	U.S. Appl. No. 10/150,272 filed May 17, 2002, Trimberger, Stephen M., entitled “Self-Erasing memory for Protecting Decryption Keys and Proprietary Configuration”, Xilinx, Inc., San Jose, CA 95124, (66 pgs).
	U.S. Appl. No. 10/150,289 filed May 17, 2002, Trimberger, Stephen M., entitled “Methods and Circuits for Maintaining Decryption-Key Security for Use in Programmable Logic Devices”, Xilinx, Inc., San Jose, CA 95124 (65 pgs.).
	U.S. Appl. No. 10/150,308 filed May 17, 2002, Trimberger, Stephen M., entitled “Programmable Logic Device that Supports Secure and Non-Secure Modes of Decryption-Key Access”, Xilinx, Inc., San Jose, CA 95124 (65 pgs.).
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