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Password Hashes

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Hashes are a cryptographic method of providing a one-way encoding of information which yields a hash value of the original value. This hash value can only be recreated using the exact same information again, and it is impossible to retrieve the original information from the hash. The strength of the hash algorithm lies in these facts.

This makes hashes perfect for encoding passwords for storage, as to check a password, the hashes are calculated and compared, rather than the plain password.

So, here’s a simple way of hashing a password in a standardised manner in .NET:


string HashedPassword =
FormsAuthentication.HashPasswordForStoringInConfigFile(
txtPassword.Text, "sha1");
if(strUserInputtedHashedPassword == storedHashedValue)
{
// sign-in successfull
}
else
{
// sign-in failed
}

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Philip is a Computer Science PhD student at Liverpool John Moores University. He's still not mastered guitar tabs, never finished Mario, and needs a haircut. He discusses life at http://www.miseldine.com/.

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