Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Tomomi Kasuya

Daisuke Suzuki

Koichi Shimizu

Mitsuru Matsui

Shinsuke Uga

Takao Wakabayashi

Takeshi Chikazawa

Tetsuya Ichikawa

A bit generation apparatus includes a glitch generation circuit that generates glitch signals which include a plurality of pulses, and T-FF bit generation circuits which input the glitch signals, and based on either rising edges or falling edges of the plurality of pulses included in the glitch signals, generate a bit value of either 0 or 1. Each of the T-FF bit generation circuits generates a respective bit value based on either the parity of the number of rising edges or the parity of the number of falling edges of the plurality of pulses. As a result of employment of the T-FF bit generation circuits, circuits that are conventionally required but not essential for the glitch become unnecessary. This serves to prevent expansion in circuit scale and increase in processing time of bit generation for the bit generation circuit.

Bit generation apparatus and bit generation method

An electronic deviceexecutes a key-using process that uses a key. A physical quantity generation partgenerates a physical quantity intrinsic to the electronic device and having a value which is different from one electronic device to another and different each time the physical quantity is generated. A key generation partgenerates the same key for each key-using process, based on the physical quantity generated by the physical quantity generation part, each time the key-using process is to be executed, immediately before the key-using process is started. A key-using process execution partexecutes the key-using process such as generation of a keyed hash value, by using the key generated by the key generation part. A control program execution partdeletes the key generated by the key generation part, each time the key-using process is ended.

Electronic device, key generation program, recording medium, and key generation method

A sub converterprovided in a data conversion apparatus for data encryption/decryption includes a data conversion function and a data transfer function or key transfer function, the sub converter converts data and transfers data that is nonlinear converted in a main converteror a key that is outputted from a key KL registerby switching between the data conversion function and the data or key transfer function.

Data conversion device and data conversion method

A random number sequence is previously generated by the function ffor data confidentiality processing, which generates a random number sequence, and stored in a random number sequence memory (buffer). When data (message) is input, the random number sequence stored in the random number sequence memory is obtained, and the data (message) is encrypted by an XOR circuit to generate ciphertext data. In case of decrypting data, a random number sequence is also previously generated by the function ffor data confidentiality processing and stored in the random number sequence memory (buffer). When the ciphertext data is input, by the XOR circuit, the random number sequence stored in the random number sequence memory is read and the ciphertext data is decrypted into the data (message).

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Tokyo, Japan

Tomomi Kasuya