Tip To Developers … Avoid Using Immutable Types for Passwords and Sensitive User Data

Here is a discussion with a developer on their code …

“Why have you stored the passwords as string?”, “Passwords are just strings. What’s the problem?”, “Well, strings are immutable objects”. “But I allocate a null string after I use it, so it’s okay!”, “But that doesn’t actually erase it from memory”. “Yes, it does”…



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Prof Bill Buchanan OBE

Professor of Cryptography. Serial innovator. Believer in fairness, justice & freedom. Based in Edinburgh. Old World Breaker. New World Creator. Building trust.