Digital Identity Guidelines, the secret is held by a party called the claimant while the party verifying the identity of the claimant is called the verifier. When the claimant successfully demonstrates knowledge of the password to the verifier through an established authentication protocol, the verifier can infer the claimant's identity.

In general, a password is a sequence of characters including letters, digits, or other symbols. If the permissible characters are constrained to be numeric,