Stolen credentials have become one of the most effective attack methods in cybersecurity because when attackers use legitimate login information, they essentially appear as authorized users, making detection extremely difficult. The problem spans both human credentials like passwords and biometrics, as well as non-human credentials like API keys and session tokens, with companies potentially managing hundreds of thousands of active tokens. While tools like dark web monitoring and services like Have I Been Pwned can help detect compromised credentials, experts say preventing theft is nearly impossible due to sophisticated phishing, social engineering attacks, and infostealer malware that continuously scrape credentials from infected systems.