What is a Pseudorandom Number Generator (PRNG) used for?

• A. A method to create truly random numbers from physical phenomena.
• B. A tool that encrypts data with a symmetric key.
• C. A way to create seemingly random numeric values.
• D. A mechanism for generating digital signatures.

Answer: (C)

A PRNG is a deterministic algorithm that produces a sequence of numbers that appear random, starting from a seed and evolving through an internal state. It’s used to generate seemingly random numeric values for tasks like simulations, testing, sampling, gaming, or any scenario where you want repeatable randomness (the same seed gives the same sequence). This distinction matters: the numbers aren’t truly random because they’re produced by an algorithm, which is why cryptographers distinguish cryptographically secure PRNGs when unpredictability is critical. The other options describe truly random generation from physical phenomena, basic data encryption, or digital signatures, which aren’t what a PRNG provides.