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Is it possible to safely check for certain characters in a password?

Basic cyber security says that passwords should be encrypted and hashed, so that even the company storing them doesn't know what the password is. (When you log in, the site performs the same encrypting and hashing steps and compares the results) Otherwise if they are hacked, the attackers get access to all the passwords.

I've noticed a few companies ask for specific characters of my password to prove who I am (eg enter the 2nd and 9th character)

Is there any secure way that this could be happening? Or are the companies storing my password in plain text?

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  • Any password restriction that LOWERS entropy is a bad restriction.

    No, I'm not answering the question, I know. But I'm answering the better question, which is "is this a stupid thing to ask of a password?", and yes it is.

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