How does SecureRandom behave in multithreaded code?

SecureRandom in Java provides a cryptographically strong random number generator (RNG). In multithreaded applications, SecureRandom can behave differently based on how it is used. When multiple threads access a single SecureRandom instance, they can cause contention, which may lead to performance bottlenecks. However, SecureRandom is thread-safe, meaning it can be safely used by multiple threads concurrently. Each thread generates random numbers based on the same internal state, but this does not compromise the security of the generated numbers.

To improve performance in multithreaded environments, you can create separate SecureRandom instances per thread. This can help to minimize contention and improve the speed of random number generation.