| 摘要 |
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.
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