Amusement devices: games – Including means for processing electronic data – Access or authorization
Patent
1995-06-29
1997-07-01
Harrison, Jessica
Amusement devices: games
Including means for processing electronic data
Access or authorization
463 16, 463 44, 463 40, 380 25, A63F 924
Patent
active
056430868
ABSTRACT:
An electronic casino gaming system includes an unalterable ROM for storing a casino game authentication program, including a message digest algorithm program, a decryption program and a decryption key. A casino game data set containing casino game rules and image data is stored in a mass storage device, such as a local disk memory or a remote network file server, along with the signature of the casino game data set. The signature is an encrypted version of the message digest of the casino game data set, prepared using a hash function. Prior to permitting game play by a player, the casino game data set is transferred from the mass storage device to main memory and during this process the message digest is computed from the image data using a hash function stored in the ROM. The encrypted version of the message digest transferred from the mass storage device is decrypted using the decryption program and decryption key stored in the unalterable ROM. The two message digests are then compared for a match: if a match exists, game play is permitted; if a match does not exist, game play is prohibited. The authentication procedure is also used to check all casino game software, both programs and fixed data sets, stored in any memory devices distributed throughout the system, such as the system boot ROM, NVRAM and all sub-system memory devices. The authentication procedure is run whenever a particular program or fixed data set is scheduled for use by the system, and also at periodic intervals and on demand.
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Alcorn Allan E.
Barnett Michael
Giacalone, Jr. Louis D.
Levinthal Adam E.
Hamrick Claude A. S.
Harrison Jessica
O'Neill Michael
Silicon Gaming, Inc.
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