Method and system for the generation and validation of personal identification numbers

摘要

A method and apparatus for encoding and decoding sequential index numbers to pseudo-random Personal Identification Codes (PINs) of varying word size in disclosed. The word size is defined by a word size control variable. The encoding and decoding process utilizes a symmetric, secret key, block encryption/decryption method. The index numbers are encrypted and the output result produces the PIN numbers. The encryption process may be reversed to a decryption process using a mode control input. When reversed to decryption, the PIN numbers are translated back into the original index numbers utilizing the same secret key for encryption. The block size of the encryption/decryption method is matched to the word size control variable. The word size defines the maximum number of index number/PIN code pairs. There is a one-to-one correspondence between a single index number and the resulting PIN number, thus forming a unique ordered pair.

主权项

1. A personal identification number (PIN) generation and verification system comprising:
an index number generator configured to generate a plurality set of ordered non-repeating index numbers having a defined range; a symmetric secret key encryption unit configured to convert the index numbers to random PIN numbers; a symmetric secret key decryption unit configured to convert one of the random PIN numbers into an unknown index number; and a verifier configured to verify the unknown index number by determining whether the unknown index number is within the defined range.