Matsushita Electric Industrial Co., Ltd.

Syunji Harada

Makoto Tatebayashi

Masayuki Kozuka

Natsume Matsuzaki

Kazuhiko Yamauchi

Hiroshi Ueda

Yoshihisa Fukushima

Takatoshi Ono

Koichiro Endo

Motoji Omori

Takeshi Saijo

Yasuo Okumura

A message receiving apparatus for receiving messages from a message transmitting apparatus generates first data for producing a display which urges a user of the message transmitting apparatus to input a message, and generates second data within the first data for specifying a conversion type for secret communication of the message. The message receiving apparatus sends the first data including the second data to the message transmitting apparatus and subsequently receives the message from the message transmitting apparatus. The message transmitting apparatus for transmitting messages to the message receiving apparatus receives the first data for producing the display and the accompanying second data for specifying the conversion type and produces the display according to the first data. On receiving the message inputted by the user in response to the display, the message transmitting apparatus converts the input message according to the second data and transmits the converted message to the message receiving apparatus.

Message receiving apparatus and message transmitting apparatus

A verifier and a claimant notify each other of verifier type information and claimant type information, respectively. The verifier determines a verifier method corresponding to a combination of the verifier type information and the notified claimant type information, generates challenge data in accordance with the determined verifier method, and transmits the challenge data to the claimant. On receiving the challenge data from the verifier, the claimant determines a claimant method corresponding to the combination of the claimant type information and the notified verifier type information. The claimant then performs claimant processing on the challenge data using the determined claimant method to obtain response data, and transmits the response data to the verifier. On receiving the response data from the claimant, the verifier performs verifier processing on the response data using the determined verifier method.

Information devices which select and use one out of plurality of encryption utilization protocols for protecting copyrights of digital productions

In the first devices, MPU 53 generates random number R1 as challenge data. Random number R3 is generated by first encryption IC 54, and then combined with random number R1, encrypted, and sent to second device 52 as encrypted text C1. When encrypted text C2 is similarly received from second device 52, first encryption IC 54 decrypts C2 and separates the decrypted result into first separated data RR2 and second separated data RR4. The first encryption IC 54 returns the first separated data to second device 52 as response data. MPU 53 compares the first separated data returned from second device 52 with random number R1, and in the event of a match, authenticates second device 52 as a legitimate device. The first encryption IC 54 generates the time-varying data transfer key by combining second separated data RR4 with random number R3, and transfers the digital copyrighted data to second device 52 by using the data transfer key.

Encryption apparatus for ensuring security in communication between

Data transmitter, data transmitting method, data receiver, information

A supplier device 70 which supplies title data is equipped with a encryption module 74 for performing an encryption which is substitutive in nature and the user device 90 which uses the title data is equipped with a decryption module 93 for performing a decryption which corresponds to the encryption. The supplier device 70 uses this encryption module 74 to prove its own authorization and authenticate other devices. Similarly, the user device 90 uses this decryption module 93 to prove its own authorization and authenticate other devices.

Communication device which performs two-way encryption authentication in

Growing community of inventors

Osaka, Japan

Syunji Harada