Insufficient Entropy in PRNG

Insufficient entropy means the PRNG's starting state or its ongoing process lacks true randomness. Instead of producing unpredictable sequences, it may generate numbers that are weak, repeatable, or follow detectable patterns. Attackers can exploit this predictability to guess security tokens, cryptographic keys, or session identifiers, leading directly to breaches like session hijacking or data decryption. For developers, the core issue often lies in using default or poorly seeded PRNGs, especially in virtualized or embedded environments where entropy sources (like user input or hardware events) are limited. To prevent this, always use cryptographically secure PRNGs (CSPRNGs) provided by your platform's security libraries, ensure they are properly seeded with high-quality entropy from reliable system sources, and avoid creating your own random number generation algorithms.