| 摘要 |
PURPOSE: A method for testing an integrated circuit including hardware and/or software parts having a confidential nature is provided to execute a test concerning a secret part without being made access to the secret part included in the integrated circuit by unauthorized persons. CONSTITUTION: A method for testing an integrated circuit containing hardware and/or software parts having a confidential nature, using a tester, wherein this method comprises the steps of in the integrated circuit, generating a random number, ciphering the random number using a key stored in the integrated circuit via a ciphering algorithm to obtain a first password, and sending the random number to the tester, and, in the tester, ciphering in parallel the random number received using a key identical to that used in the integrated circuit via an identical ciphering algorithm to that implemented in the integrated circuit, to generate the second password, and sending the second password from the tester to the integrated circuit, then, in the integrated circuit, comparing the first and second passwords, freeing a test path leading from the tester to the parts of a confidential nature, only if the comparison establishes a match between the first and second passwords, and effecting the test of the elements of a confidential nature. |
