REMOTE FUNCTION CHANGING METHOD

摘要

PROBLEM TO BE SOLVED: To remotely change the function of a normal terminal equipment without acquiring data illegally. SOLUTION: A terminal 3 is started from a center 1 via a communication circuit, and the center 1 and the terminal 3 are authenticated with each other by a secret key symmetric cipher technology or a public key asymmetric cipher technology (S2, S3). If both the center 1 and the terminal 3 are authenticated legal, the program and data which are necessary for the change of the function of the terminal 3 are partly ciphered and sent to the terminal 3 from the center 1 (S6, S7). The terminal 3 decodes the received signals and writes partly the above program and data into a memory, for partly changing its function (S10 and S11).