A Cryptographic Random Number Generator (CRNG) is a tool used to produce numbers that are difficult to predict. These numbers are essential for securing data in various applications, such as encryption, digital signatures, and secure communications. Unlike regular random number generators, CRNGs are designed to withstand attacks from malicious users who might try to guess the generated numbers. CRNGs rely on complex algorithms and unpredictable sources of entropy, such as system events or hardware noise, to ensure the randomness of the output. This makes them suitable for cryptographic purposes, where the security of sensitive information depends on the unpredictability of the generated numbers.