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. 13, 2005
Filed:
Jan. 18, 2001
Fabrice Walter, Marin, CH;
Hugues Blangy, Neuchâtel, CH;
Fabrice Walter, Marin, CH;
Hugues Blangy, Neuchâtel, CH;
EM Microelectronic—Marin SA, , CH;
Abstract
This method uses a tester (T) capable of being connected to an integrated circuit (CI) to be tested. A random number (RNG-C) is generated and ciphered using a key (k) by a cipher algorithm to obtain a password (G(RNG)-C). The random number (RNG-C) is sent to the tester (T) in which the received random number (RNG-C) is ciphered using the same key (k) by a same cipher algorithm to generate therein a second password (G(RNG)-T). This latter is sent to the integrated circuit (CI) to be compared to the first password (G(RNG)-C). The test of the confidential parts () of the circuit is only authorised if the two passwords exhibit the required match.