Checking 3 Random Letters From A Hashed Password?

Sep 21, 2010

I have a system where I salt and hash passwords before saving them to the database, using FormsAuthentication in asp.net

What I want to do is, rather than ask the customer for their password each time, I just want 3 random letters from their password. How can I compare this to the hash in the database? Will hashing still work in this case? From what I gather hashing is only designed to be a one way process and shouldn't be decrypted, so is checking 3 random letters for a hash even possible?

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