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Are You Sure SHA-1+Salt Is Enough For Passwords? 409

Melchett writes "It's all too common that Web (and other) applications use MD5, SHA1, or SHA-256 to hash user passwords, and more enlightened developers even salt the password. And over the years I've seen heated discussions on just how salt values should be generated and on how long they should be. Unfortunately in most cases people overlook the fact that MD and SHA hash families are designed for computational speed, and the quality of your salt values doesn't really matter when an attacker has gained full control, as happened with When an attacker has root access, they will get your passwords, salt, and the code that you use to verify the passwords."

I have a theory that it's impossible to prove anything, but I can't prove it.