Platform
RNG (Random Number Generator)
Random Number Generator
Definition
The certified algorithmic system generating random outcomes for casino game results. A foundational technical and regulatory component for any online casino product.
Key takeaways
- The RNG generates the outcome of every slot spin, virtual table game and instant game, and regulated markets require it to be certified.
- Test labs such as GLI, BMM, iTech Labs and eCOGRA check output for statistical randomness, unpredictability and resistance to manipulation.
- GLI-19, the GLI standard for interactive gaming systems, sets detailed RNG requirements; GLI-33 covers sportsbook systems.
Why it matters
The RNG is the mathematical foundation of online casino integrity. Each slot spin, virtual table game outcome, and instant game result derives from RNG output, with regulator-certified RNGs required in every regulated market. Lab certification (GLI, BMM, iTech, eCOGRA) tests RNG output for statistical randomness, sequence unpredictability, and resistance to manipulation. The certification is repeated periodically and must be maintained alongside the operating platform.
The RNG sits within the RGS (Remote Gaming Server) infrastructure. Modern RNGs are typically hardware-based (using physical entropy sources) or software-based with high-quality entropy seeding. The certification requirements are detailed and technical, with standards like GLI-19 specifying acceptable RNG implementations. Failed RNG certification can be commercially catastrophic for a game or platform: the underlying outcomes have been demonstrated unreliable, requiring rework before re-certification. The discipline is mature and well-supported by industry tooling.
Sources
- GLI-19: Standards for Interactive Gaming Systems, Version 3.0 - Gaming Laboratories International
- GLI-33: Standards for Event Wagering Systems, Version 1.1 - Gaming Laboratories International
- Remote gambling and software technical standards - Gambling Commission
Frequently asked questions
How often is RNG certification renewed?
Periodically, typically annually or on material changes to the implementation. Continuous monitoring complements periodic re-certification. Modern operators and suppliers run automated statistical testing alongside lab certification to catch drift between formal certifications.
Can RNGs be manipulated by operators?
Not in any compliant implementation. The RNG generates outcomes independent of operator-visible game state, and certification specifically tests for manipulation resistance. Allegations of rigged RNGs occasionally appear in player forums but compliant certified implementations don't permit manipulation, and regulator enforcement on rigging would be severe.