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. 16, 2005
Filed:
Jun. 12, 1999
Louis Gregoire, Cassis, FR;
Louis Gregoire, Cassis, FR;
Gemplus, Gemenos Cedex, FR;
Abstract
The present invention relates to a method for verifying the execution of a computer program, comprising the following steps: 1) a program is split up into at least two parts, one public and one secret, whereby the public part is executed on a first processing means and the second part is executed on a second secure processing means; 2) the public part is placed in a memory pertaining to the first processing means; 3) the secret part is placed on a secure support pertaining to the second processing means in order to be connected to the first processing means; 4) the following operations are performed so that the program can be executed by the first processing means: a) the second processing means is connected to the first and parameters and variables that are a function of external signals triggered by a user are transmitted from the first processing means to the second, b) at least one part of the program is executed by the second processing means, implementing a certain number of received parameters/variables, c) the results of the execution as described in b) are transmitted from the second processing means to the first, d) a certain number of said results are used in the execution performed by the first means. The invention is characterized in that the second means is a portable and detachable auxiliary support which is provided with a chip.