How does an RNG work in online casinos?

The random number generator, also known as the RNG, serves as a fundamental component in numerous video games. However, comprehending the inner workings of a genuine random number generator within a computer game is relatively straightforward. Yet, how exactly does the RNG function in online games? Furthermore, what purpose does it serve in game development? This article will delve into the internal mechanics behind RNGs and elucidate why they stand as paramount elements of game design.

Random Number Generation in Gaming

Players who have already experienced some slot games will be aware that the iGaming world is brimming with unpredictable data. No player can truly know when they will win or if they will win at all, all thanks to a mechanism employed to generate numbers randomly. The realm of iGaming is filled with uncertain outcomes, making it an exhilarating experience for players seeking the thrill of chance.

Whether you’ve witnessed an RNG in action within a video game or this is your inaugural encounter with such a mechanism, let us unravel it all for you. No matter your level of familiarity, we’ll break it down step by step.

What is a random number generator?

As its name implies, a random number generator is a mechanism or application that relies on mathematical formulas to produce a random outcome. Many players hold the belief that RNGs are a byproduct of today’s advanced computer programming skills, but in truth, they have a long history dating back to the past. Random number generators have been around for quite some time, and they continue to play a significant role in various fields and industries. These algorithms employ intricate mathematical calculations to generate sequences of numbers that exhibit no discernible pattern or predictability. By leveraging the power of computational algorithms, RNGs have become an indispensable tool in fields such as cryptography, scientific simulations, and statistical analysis. Whether it’s for generating lottery numbers, simulating complex scenarios, or ensuring fair gameplay in online casinos, random number generators have proven to be invaluable in producing unpredictable and unbiased outcomes.

From ancient times, games of chance have been in existence, whether in the form of coin flipping, drawing straws, rolling dice, or shuffling cards. The sole distinction between these forms of RNG and present-day deterministic computer programs is that a true random number generator cannot rely on mathematical equations to produce a genuinely random number. If an equation is involved, it cannot be considered random.

That is why most of today’s random number generators are actually pseudo-random number generators, as the seed value is known and therefore the outcome can be predicted. However, they are sufficient for most tasks, as true randomness is not required all the time: a slot machine only needs to appear random.

How do casinos make use of RNGs?

Random number generators employ various algorithms to generate random numbers that are incorporated into games. An RNG algorithm may be more advanced than another, but they all rely on a set of principles that ensure the resulting numbers are genuine random numbers.

One of those principles is referred to as randomness. Randomness is a metric that quantifies the unpredictability of a data set. The higher the level of randomness, the more unpredictable the data becomes. The RNG will employ a data set with high levels of randomness to generate a random number. In the event you loved this post and you would love to receive more information regarding assure visit the site. This set is constantly updated, ensuring that the generated numbers are always unique.

A crucial principle to consider is the concept of sowing. Sowing ensures that every time the RNG generates a fresh set of random numbers, it does so in a unique manner. This prevents the occurrence of the same number sequence being generated twice. By using a different seed value, random number generators can produce billions of unique sequences of true random numbers, unless, of course, you are working with true random number generators.

A TRNG doesn’t require a seed to operate because TRNGs are digital snapshots of thermal or atmospheric noise and electromagnetic pulses, but we’ll discuss that later on.

The core of casino game development lies in these principles. The unpredictability of spin outcomes, digital dice rolls, or card shuffling is ensured by Random Number Generators (RNG). This signifies that every player has equal chances of winning and losing. It is crucial, therefore, to exclusively engage with licensed online casinos that collaborate with authorized game providers. Operators and suppliers offering services with accredited licenses ensure the safety and fairness of games in all aspects.


In order to truly grasp the inner workings of an RNG and how it generates completely random data, let’s delve into the actual functioning of a random generator by comparing it with RTP. To gain a thorough understanding of the extent to which an RNG can produce truly random outcomes, it is essential to explore its mechanics with reference to the RTP mechanism.

Differences between Random Number Generator (RNG) and Return to Player (RTP)

The Return to Player (RTP) stands as a percentage value that symbolizes the theoretical return of a game if played infinitely. It typically hovers around 96-98% for most online slot games, for instance. The remaining portion is deemed as the casino’s revenue, as it offsets any potential loss and covers all operational costs, such as staff salaries, RNG testing, and other expenditures.

In online slot machines, the return-to-player (RTP) is a statistical average derived from millions of spins. This statistical data is built into the game, and providers must pass all audits and inspections that verify the fairness of the game and the accuracy of the RTP. This is where the random number generators (RNG) come into play, as they directly influence the randomness of all game outcomes, such as the frequency and size of the winnings.

In a particular game, the house advantage serves as the casino’s edge over the player, similar to RTP. For instance, a 98% RTP equates to a 2% house advantage. Nevertheless, the concept of the house advantage is commonly used in live games. This is partly because the house advantage can fluctuate based on the player’s decisions in table and card games. As more variations of these games emerge, you will notice that many providers choose to express the house advantage as RTP, particularly when it comes to side bets.


Let’s take a closer look at the various types of random number generators that exist before delving into and exploring the randomness in online casino games.

There are two primary categories of RNG: hardware RNG and software RNG. Random number generators by hardware are physical devices that produce random numbers. There are various types of hardware RNG, all with a common objective: to generate random numbers. These random numbers can be used for various purposes, such as generating cryptographic keys, selecting lottery numbers, simulating random events, or determining which symbols will appear on the reels of your favorite slot machine. Hardware RNGs can be divided into two main categories: true random number generators (TRNG) and pseudo-random number generators (PRNG).

A software-based random number generator is a computer program that generates random numbers. There are also various types of software RNGs; they are typically PRNGs, meaning that the software RNG is based on algorithms to mimic the selection of a value in order to approximate true randomness. For instance, a cryptographically secure pseudo-random number generator (CSPRNG). CSPRNGs extract random numbers from physical events occurring in a game and encode them with an appropriate hash function for cryptography. Thus, it functions just like any other pseudo-random number generator.

Returning to what we discussed earlier, it’s important to note that a pseudo-random generator is unable to generate truly random numbers; it can only produce pseudo-random numbers.

RNGs in Casino Games

Random number generators play a crucial role in the design of every casino game. They have the responsibility of generating random numbers that can be used in various ways, ranging from creating variability and unpredictability to simulating a realistic game. The RNGs rely on their reservoir of high entropy data to generate each number, ensuring that the resulting sequence is unpredictable and unique. By utilizing different seeds, the RNGs create countless possibilities for new sequences, thereby ensuring that all players have equal chances of winning.

Random Number Generation in Board Games

Playing online slot machines and RNG table games is a prime illustration of random number generators in action. RNG table games rely on the outcomes produced by an algorithm. In a way, when you play at an RNG table, you are challenging the algorithm itself.

Random Number Generation in Live Casino Games

During the gameplay, the dealer is responsible for generating all the card draws, spins, and dice rolls. The crupier is in charge of orchestrating every card shuffle, spin rotation, and dice throw that takes place throughout the game. It is their role to ensure that each outcome is fair and unbiased, providing an authentic and thrilling gaming experience for all the players involved. With their expertise and precision, they meticulously create each turn, instilling an element of anticipation and excitement in the atmosphere. Players eagerly await the crupier’s skilled manipulations, as they hold the power to determine the outcome of each game and shape the course of destiny.

The way these games operate is that each spin of the wheel or hand of the RNG has its own unique seed and truly random outcome: the random number generator doesn’t “look ahead” to see what will happen next and adjust the results accordingly. No matter how many times you play with the same bets, each spin of the wheel will be independent and unpredictable.

“Can you deceive an online RNG?”

Online RNGs, also known as pseudo-random number generators, are quite intricate. Despite the fact that the generated numbers are not truly random, RNGs feature sophisticated mathematical algorithms that are embedded within the software and encryption. Furthermore, numerous providers oversee their RNGs with concealed surveillance, making it nearly impossible to deceive an online random number generator, almost.

As RNGs are iterations of a function call, what you essentially require is a key or encryption to decipher the algorithm, also known as a seed. When the seed is discovered, a hacker can replace the pseudo-random bits with more predictable numbers. All it takes is finding the seed, and the hacker gains the ability to manipulate the supposedly random outcomes.

That being said, it is, however, much easier said than done. Service providers grapple fiercely to ensure that their games are equipped with the most comprehensive security protocols, employing a plethora of defensive strategies. But in reality, the implementation of such measures is a formidable challenge that requires meticulous planning and constant vigilance. It is a constant cat-and-mouse game between the developers and malicious actors, where every move is strategic and every decision carries weight. The ever-evolving landscape of cybersecurity demands a proactive approach, with constant updates and enhancements to stay one step ahead of potential threats. It is a complex and ongoing battle, but one that is necessary to safeguard the interests and trust of users worldwide.

Frequently Asked Questions about RNG

Do casinos use a random number generator?

Yes. Online casinos employ online random number generators, also known as pseudo-random number generators, to randomly generate a set of sequences or winning numbers every time players spin the game. A random number generator is not only used for online games but also for Live Casino games and table games.

✅ How do you win at slot machines with RNGs?

When you spin the reels, pseudo-random number generators operate by generating a random sequence of symbols each time. Random number generation, as the name implies, is completely unpredictable to a certain extent, so there is no way to guarantee a win while you play.

✅ Can you beat random number generators at online casinos?

Even though a random number generator relies on a series of repeated calls to function, all you really need is a key or encryption to decode the algorithm and replace it with less random data.

That being said, providers, however, implement the most comprehensive protocols by employing a wide array of defensive strategies, making it much easier said than done.

✅ Are RNGs fair?

Most of the time, RNGs are completely fair if you gamble at a licensed online casino associated with licensed game providers. Operators and suppliers offering services with accredited licenses ensure that the games are secure and equitable in every aspect.

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