Patent ID: 6598031
Filing Date: 2003-07-22
Classification: G06Q,G07F

Abstract:
A method for decoding an encrypted transaction card identifying number transmitted from a first computing system across a public network and for transmitting said transaction card identifying number to a second computing system, wherein said transaction card identifying number is encrypted within an encryption unit identified by a serial number, and wherein said method comprises steps of:(a) receiving said encrypted transaction card identifying number and said serial number from said public network; (b) generating a single-use number; (c) storing said single-use number, said serial number, and said encrypted transaction card identifying number in a first data structure, wherein said serial number and said encrypted transaction card identifying number are found by locating said single-use number; (d) receiving a number; (e) second second number is stored within said first data structure as a single-use number; (f) second second number is determined to be stored within said first data structure as said single-use number, finding a cryptogram in a second data structure; wherein said cryptogram is found by locating said serial number in said second data structure equal to said serial number in said first data structure found by locating said single-use number in said first data structure; (g) decoding a first portion of said encrypted transaction card identifying information with said cryptogram to generate a transaction card identifying number; and (h) transmitting said transaction card identifying number to said second computing system.