US5643086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic casino gaming apparatus with improved play capacity, authentication and security
Assignee: International Game Technology
•
Filing: 1995-06-29
•
Granted: 1997-07-01
•
Expires: 2015-06-29
Abstract
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.
Inventors
- 👤 Allan E. Alcorn
- 👤 Michael Barnett
- 👤 Louis D. Giacalone, Jr.
- 👤 Adam E. Levinthal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:13
CPC Classifications
G; G06; G06F; G06F21/00; G06F21/50; G06F21/51; G06F21/57; G06F21/60; G06F21/64; G06Q; G06Q50/00; G06Q50/34; G07; G07F; G07F17/00; G07F17/32; G07F17/3286; G07F17/3288; H; H04; H04L; H04L9/00; H04L9/06; H04L9/0643; H04L9/32; H04L9/3236; H04L9/3247; G06F2211/00; G06F2211/007; G06F2221/00; G06F2221/21; G06F2221/2109; H04L2209/00; H04L2209/60
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
176 words
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.
Claim 2
Dependent Claim
176 words
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.
Claim 3
Dependent Claim
15 words
The apparatus of claim 1 wherein said first storing means comprises a mass storage device.
Claim 4
Dependent Claim
15 words
The apparatus of claim 2 wherein said mass storage device comprises a disk drive unit.
Claim 5
Dependent Claim
14 words
The apparatus of claim 2 wherein said mass storage device comprises a CD-ROM unit.
Claim 6
Dependent Claim
15 words
The method of claim 2 wherein said mass storage device comprises a network storage unit.
Claim 7
Dependent Claim
16 words
The apparatus of claim 1 wherein said second storing means comprises a read only memory device.
Claim 8
Dependent Claim
16 words
The apparatus of claim 6 wherein said read only memory device comprises an unalterable memory device.
Claim 9
Dependent Claim
54 words
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.
Claim 10
Dependent Claim
17 words
The apparatus of claim 8 wherein said second ROM portion is used to store a decryption key.
Claim 11
Dependent Claim
175 words
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.
Claim 12
Dependent Claim
175 words
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.
Claim 13
Dependent Claim
14 words
The apparatus of claim 10 wherein said first storing means comprises a memory device.
Claim 14
Dependent Claim
14 words
The apparatus of claim 11 wherein said memory device comprises a read only memory.
Claim 15
Dependent Claim
12 words
The apparatus of claim 11 wherein said memory device comprises a RAM.
Claim 16
Dependent Claim
16 words
The apparatus of claim 10 wherein said second storing means comprises a read only memory device.
Claim 17
Dependent Claim
16 words
The apparatus of claim 14 wherein said read only memory device comprises an unalterable memory device.
Claim 18
Dependent Claim
54 words
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.
Claim 19
Dependent Claim
17 words
The apparatus of claim 14 wherein said second ROM portion is used to store a decryption key.
Claim 20
Dependent Claim
14 words
The apparatus of claim 10 wherein said casino game software information comprises program information.
Claim 21
Dependent Claim
16 words
The apparatus of claim 10 wherein said casino game software information comprises a fixed data set.
References Cited (Backward Citations)
US4218582A
Cited
US4865321A
Cited
US4759064A
Cited
US4752068A
Cited
US5004232A
Cited
US5326104A
Cited
US5489095A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-06-30 | 2000-12-30 | 2001-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-06-30 | 2004-12-30 | 2005-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-06-30 | 2008-12-30 | 2009-07-01 | $7700.00 | Window Closed / Lapsed |