Part III: Slot Machine Cheating · Electronic & Digital Cheating Methods · #6.2
Keno/Lottery RNG Prediction (Ron Harris Method)
How it works
Ron Harris, a Nevada Gaming Control Board (NGCB) computer technician, used his privileged access to confidential source code to reverse-engineer the PRNG algorithms used in electronic keno games and slot machines. For keno, he developed a predictive algorithm that could determine which numbers the game’s PRNG would select in advance using a copy of the game’s number-generating program and its earlier results. For slot machines, he secretly altered the program on the laptops Control Board agents used to check slot machines, so that a cheat was loaded when an agent hooked up to a machine, embedding hidden “backdoor” code that would trigger jackpots when specific coin insertion sequences were performed. His method exploited the deterministic nature of early PRNGs, which used machine time as their primary seed value. Harris could predict keno outcomes down to the exact second, giving his accomplice an effectively guaranteed winning ticket.
Where it appears
Electronic keno machines, slot machines and video poker machines in Nevada: primarily in Nevada casinos and at Bally’s Park Place in Atlantic City
On the record
Ron Harris operated from 1993-1995. His accomplice Reid McNeal attempted to collect a $100,000 keno payout at Bally’s Park Place in Atlantic City in January 1995: casino executives became suspicious and contacted New Jersey gaming investigators. Harris was sentenced to seven years in prison in January 1998 (served two years). He was permanently banned from all Nevada casinos (Black Book entry February 20, 1997) and added to New Jersey’s exclusion list June 21, 1995. The case exposed massive vulnerabilities in gaming regulatory oversight.
Detection & preventionADVISORY
The paid halfHow a monitoring room catches keno/lottery rng prediction (ron harris method), and what stops it recurring, written for the desk, not the reader.
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Published as a detection reference for surveillance, compliance and gaming-operations professionals. Thresholds and tuning are set by the property. Nothing here is instruction: the method is described so it can be recognised.