System and method of emulation cipher between two hardware modules

Application Number: 00107427
Application Date: 2000.05.12
Publication Number: 1291025
Publication Date: 2001.04.11
Priority Information: 1999/10/1 US 09/411581
International: H04L9/00
Applicant(s) Name: Genetic Ware Co., Ltd., British Virgin Islands
Inventor(s) Name: Chien-Tzu Hou
Patent Agency Code: 72003
Patent Agent: chen gong
Abstract A method and system for emulating a secret code between a first hardware module to a second hardware module. First, the secret code that is initially stored in the first hardware module is transformed into a transformed secret code according to a transformation pattern randomly selected from a set of possible transformation patterns. Then the transformed secret code is transferred to the second hardware module. Next, the second hardware module can repeatedly guess a hypothetical secret code from the transformed secret code by using a transformation pattern selected from the possible transformation patterns and reversing the effect of the selected transformation pattern on the transformed secret code. In addition, the hypothetical secret code is used to encode a test sample, and the encoded test sample is sent back to the first hardware module. Accordingly, the first hardware module can verify the validity of the current hypothetical secret code by checking the encoded test sample. After proving that a current hypothetical secret code is the same as the true secret code, the first hardware module informs the second hardware module of such a match result and stops the process.