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:
Mar. 03, 2009
Filed:
Mar. 19, 2004
Lauri Paatero, Helsinki, FI;
Lauri Paatero, Helsinki, FI;
Nokia Corporation, Espoo, FI;
Abstract
The present invention relates to a method of, and a system for, enhancing data security, which data is to be executed in an electronic device () comprising a secure execution environment () to which access is restricted. A basic idea of the present invention is that, at device boot, data in the form of e.g. program code is copied from permanent memory () to temporary memory (). The integrity of this program code must be verified to ensure that the program code has not been altered during the transmission between the memories. Further, a new secret key is generated in the secure execution environment. This new secret key is used by a device processor () to encrypt the program code to be stored in the temporary memory in order to ensure that the program code is kept secret during transmission. The device processor thereafter writes the encrypted program code into the temporary memory.