Patent ID: 8768843

Claim:
A wager based gaming machine comprising: a bill validator or cashless credit acceptor; a mass storage volume; a microprocessor; an operating system stored in the mass storage volume; a gaming application; a read only basic input output system (“BIOS”) chip; BIOS operating instructions stored within the read only BIOS chip; and a certificate of a code signing certificate authority stored within the read only BIOS chip; wherein the gaming machine is configured by the operating system and the BIOS operating instructions to: receive a certificate revocation list; authenticate the certificate revocation list; store the authenticated certificate revocation list in the mass storage volume; validate that a public key is certified by a code signing certificate authority by referencing the certificate of the code signing authority stored within the read only BIOS chip; utilize the certificate revocation list in the mass storage volume to ascertain whether the code signing certificate authority has revoked a code signing certificate issued to the code signing authority; and authenticate the gaming application using the validated public key.