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:
Apr. 20, 2004
Filed:
Oct. 05, 2001
Martin Lyons, Alexandria, AU;
Robert Linley Muir, Rosebery, AU;
Aristocrat Technologies Australia Pty Ltd., Lane Cove, AU;
Abstract
A gaming machine is described in which all interested parties to a game program to run on the gaming machine, will digitally sign each piece of approved program prior to installation. These signatures are stored with the program on a mass storage device inside the gaming machine. When the machine needs to load a piece of program, or upon an external command after a significant event such as a jackpot payout, it will execute the SHA-1 program code in the EPROM on the program being loaded, and then perform a DSA verification operation using the SHA-1 output as one of the parameters. The DSA verification operation will be repeated for every digital signature stored with the program, and all must be valid, so that it is impossible to execute program code that has not been approved by the manufacturer, the jurisdictional authority and optionally the casino and/or other parties.