Patent ID: 8312288

Claim:
A method for disclosing a personal identification number (“PIN”) associated with an account, comprising: (a) receiving a request to disclose the PIN, the PIN comprising a plurality of PIN characters encrypted in a first PIN block; (b) generating account data for the account; (c) generating, by a processor, a PIN offset comprising a plurality of PIN offset characters using the account data and the PIN characters encrypted in the first PIN block; (d) modifying a portion of the PIN offset characters of the PIN offset other than one unmodified PIN offset character; (e) creating, by the processor, a second encrypted PIN block using the modified PIN offset and the account data; (f) decrypting, by the processor, the second encrypted PIN block; and (g) outputting a PIN character of the decrypted second PIN block corresponding to the unmodified PIN offset character of the PIN offset.