Abstract: Disclosed herein is an encryption and decryption communication semiconductor device comprising at least, a communication interface for performing a transfer of data according to a predetermined communication system, one or two or more encryption/decryption circuits which encrypt or decrypt input data in accordance with a predetermined algorithm, and a plurality of external interfaces for performing the input/output of data from and to external devices. The communication interface, the encryption/decryption circuits and the plurality of external interfaces are formed on one semiconductor chip. In the cryption and decryption communication semiconductor device, input data sent from any one of the plurality of external interfaces is encrypted or decrypted by at least one of the encryption/decryption circuits and is capable of being outputted to any different one of the plurality of external interfaces.

Abstract: In an authentication communicating semiconductor device to enhance protection against illegal copying, a logic analyzer probe or the like is connected to a CPU bus to suppress possibility in which the authentication process is intercepted and is analyzed to break the mechanism of illegal copy protection and the electronic device is modified to set a tampered encryption key to the CPU bus. The authentication communicating semiconductor device includes a semiconductor chip, a main processing unit formed on the chip for generating a key code according to a predetermined algorithm, for determining approval/non-approval of communication of data with an external device, and for controlling the communication; an encryption unit formed on the chip for encrypting and decoding communication data using the key code generated by the main processing unit, and an interface unit formed on the chip for conducting communication with an upper-layer or a lower-layer according to a predetermined protocol.

Abstract: Disclosed herein is a cryption and decryption communication semiconductor device comprising at least, a communication interface for performing a transfer of data according to a predetermined communication system, one or two or more encryption/decryption circuits which encrypt or decrypt input data in accordance with a predetermined algorithm, and a plurality of external interfaces for performing the input/output of data from and to external devices. The communication interface, the encryption/decryption circuits and the plurality of external interfaces are formed on one semiconductor chip. In the cryption and decryption communication semiconductor device, input data sent from any one of the plurality of external interfaces is encrypted or decrypted by at least one of the encryption/decryption circuits and is capable of being outputted to any different one of the plurality of external interfaces.

Abstract: In an authentication communicating semiconductor device to enhance protection against illegal copying, a logic analyzer probe or the like is connected to a CPU bus to suppress possibility in which the authentication process is intercepted and is analyzed to break the mechanism of illegal copy protection and the electronic device is modified to set a tampered encryption key to the CPU bus. The authentication communicating semiconductor device includes a semiconductor chip, a main processing unit formed on the chip for generating a key code according to a predetermined algorithm, for determining approval/non-approval of communication of data with an external device, and for controlling the communication; an encryption unit formed on the chip for encrypting and decoding communication data using the key code generated by the main processing unit, and an interface unit formed on the chip for conducting communication with an upper-layer or a lower-layer according to a predetermined protocol.