Electronic casino gaming apparatus with improved play capacity, authentication and security

• US 5,643,086 A
• Filed: 06/29/1995
• Issued: 07/01/1997
• Est. Priority Date: 06/29/1995
• Status: Expired due to Term

• Current Assignee: IGT (International Game Technology)
• Original Assignee: Silicon Gaming, Inc. (International Game Technology)
• Inventors: Barnett, Michael, Levinthal, Adam E., Alcorn, Allan E., Giacalone, Louis D. Jr.
• Primary Examiner(s): Harrison, Jessica
• Assistant Examiner(s): ONEILL, MICHAEL W
• Application Number:
  US08/497,662
• Time in Patent Office: 733 Days
• Field of Search: 380/24, 380/4, 380/9, 380/23, 380/30, 380/49, 380/50, 380/59, 463/29, 463/16, 463/40, 463/41, 463/42, 463/44
• US Class Current: 463/29
• CPC Class Codes: G06F 21/00 Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
• CPC Class Codes: G06F 21/51 at application loading time, e.g. accepting, rejecting, starting or inhibiting executable software based on integrity or source reliability
• CPC Class Codes: G06F 21/57 Certifying or maintaining trusted computer platforms, e.g. secure boots or power-downs, version controls, system software checks, secure updates or assessing vulnerabilities
• CPC Class Codes: G06F 21/64 Protecting data integrity, e.g. using checksums, certificates or signatures
• CPC Class Codes: G06F 2211/007 Encryption, En-/decode, En-/decipher, En-/decypher, Scramble, (De-)compress
• CPC Class Codes: G06F 2221/2109 Game systems
• CPC Class Codes: G06Q 50/34 Betting or bookmaking, e.g. Internet betting
• CPC Class Codes: G07F 17/32 for games, toys, sports, or amusements
• CPC Class Codes: G07F 17/3288 Betting, e.g. on live events, bookmaking
• CPC Class Codes: H04L 2209/60 Digital content management, e.g. content distribution
• CPC Class Codes: H04L 9/0643 Hash functions, e.g. MD5, SHA, HMAC or f9 MAC
• CPC Class Codes: H04L 9/3236 using cryptographic hash functions
• CPC Class Codes: H04L 9/3247 involving digital signatures

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.

Claims

1. An electronic gaming apparatus for providing authentication of a data set of a casino type game, said system comprising:

first means for storing a casino game data set and a signature of said casino game data set, said signature comprising an encrypted version of a unique first abbreviated bit string computed from the casino game data set;

second means for storing an authentication program capable of computing a second abbreviated bit string from the casino game data set stored in said first storing means and capable of decrypting an encrypted signature stored in said first storing means to recover the first abbreviated bit string;

processing means for enabling the authentication program to compute an abbreviated bit string from the casino game data set stored in said first storing means and for enabling the authentication program to decrypt the encrypted signature stored in said first storing means to provide a decrypted abbreviated bit string; and

means for comparing the computed second abbreviated bit string with the decrypted abbreviated bit string to determine whether a match is present.

2. The apparatus of claim 1 wherein said first storing means comprises a mass storage device.

3. The apparatus of claim 2 wherein said mass storage device comprises a disk drive unit.

4. The apparatus of claim 2 wherein said mass storage device comprises a CD-ROM unit.

5. The method of claim 2 wherein said mass storage device comprises a network storage unit.

6. The apparatus of claim 1 wherein said second storing means comprises a read only memory device.

7. The apparatus of claim 6 wherein said read only memory device comprises an unalterable memory device.

8. The apparatus of claim 6 wherein said read only memory device includes a first portion for storing that portion of said authentication program capable of computing the abbreviated bit string from the casino game data set, and a second portion for storing that part of the authentication program capable of decrypting the encrypted signature.

9. The apparatus of claim 8 wherein said second ROM portion is used to store a decryption key.

10. An electronic gaming apparatus for providing authentication of software information relating to a casino type game, said apparatus comprising:

first means for storing casino game software information and a signature of said casino game software information, said signature comprising an encrypted version of a unique first abbreviated bit string computed from the casino game software information;

second means for storing an authentication program capable of computing a second abbreviated bit string from the casino game software information stored in said first storing means and capable of decrypting an encrypted signature stored in said first storing means to recover the first abbreviated bit string;

processing means for enabling the authentication program to compute an abbreviated bit string from the casino game software information stored in said first storing means and for enabling the authentication program to decrypt the encrypted signature stored in said first storing means to provide a decrypted abbreviated bit string; and

means for comparing the computed second abbreviated bit string with the decrypted abbreviated bit string to determine whether a match is present.

11. The apparatus of claim 10 wherein said first storing means comprises a memory device.

12. The apparatus of claim 11 wherein said memory device comprises a read only memory.

13. The apparatus of claim 11 wherein said memory device comprises a RAM.

14. The apparatus of claim 10 wherein said second storing means comprises a read only memory device.

15. The apparatus of claim 14 wherein said read only memory device comprises an unalterable memory device.

16. The apparatus of claim 14 wherein said read only memory device includes a first portion for storing that portion of said authentication program capable of computing the abbreviated bit string from the casino game software information, and a second portion for storing that part of the authentication program capable of decrypting the encrypted signature.

17. The apparatus of claim 14 wherein said second ROM portion is used to store a decryption key.

18. The apparatus of claim 10 wherein said casino game software information comprises program information.

19. The apparatus of claim 10 wherein said casino game software information comprises a fixed data set.