Fujitsu Corporation

Isamu Fukuda

Nobuyuki Fukuda

Kazuhiro Yasuno

Kenji Fukuda

Akihiro Kameda

Toshifumi Inoue

Kiyohisa Hoshino

Hiroshi Kubo

Hisamitsu Takagi

Toru Irie

Kazuyuki Minohara

Shigeaki Kawamata

Takashi Ifuji

Akihiro Kobayashi

Toshihiro Kobayashi

Yoshiaki Fukunaga

Satoru Hirasawa

Atsushi Yabe

Yasuhiro Yoshika

Tetsuta Sakabe

Akio Ohhashi

Katsuhiko Negoto

Atsushi Morohashi

Yashushi Miyagawa

Kouichirou Higashi

Jun Roppongi

In a first transmission apparatus, a first head encryption unit encrypts a head block of first plain text using ID. A non-head encryption unit encrypts a block using the preceding encrypted block. A first transmitter transmits first encrypted data and the ID to a second transmission apparatus. A first holding unit holds end encrypted data. A second head encryption unit encrypts a head block of second plain text using the end encrypted data. A second transmitter transmits second encrypted data generated by the second head encryption unit to the second transmission apparatus. In the second transmission apparatus, a first decryption unit performs decryption on the first encrypted data using the ID. A second holding unit holds the end encrypted data included in the first encrypted data. A second decryption unit decrypts the second encrypted data using the end encrypted data.

Transmission system, transmission method and encrypting apparatus

A communication apparatus performs encryption on data transmitted from another communication apparatus by using first or second cryptographic algorithm, or performs decryption on the data that has been encrypted using the first or second cryptographic algorithm, by using one of the first and second cryptographic algorithms used for the encryption, where the second cryptographic algorithm provides a higher security level than the first cryptographic algorithm. The communication apparatus includes an encryption unit configured to perform, upon receiving the data including a cryptographic class identifying a parameter to be used for performing the encryption or the decryption, the encryption or the decryption by using one of the first and second cryptographic algorithms, based on the cryptographic class.

Apparatus and method for performing different cryptographic algorithms in a communication system

An encrypted communication device includes: a pattern generation unit configured to judge whether or not a security association including as matching data a data portion whose data pattern matches between data in a packet targeted for processing and data in a sample packet is to be generated; a key information exchange unit configured to transmit to an opposite device a key information exchange packet including the matching data and key data when the pattern generation unit judges that the security association is to be generated, and receives from the opposite device a key information exchange packet including a security association identifier of the security association, thereby establishing the security association with the opposite device; and a key information unit configured to store the matching data, the key data, and the security association identifier of the security association established by the key information exchange unit.

Encrypted communication device and method for performing encrypted communication while reducing traffic in communication system

A system includes: a first radio base station including: a first processor which performs processes to transmit and receive a first encryption key, and an first interface which transmits or receives the encapsulated packet, the second radio base station includes: a second interface which transmits or receives the encapsulated packet; and a second processor which encrypts or decrypts the packet with the first encryption key, the host node includes: a third processor which encrypts or decrypts the packet, and during processing of a handover of the mobile station, the host node transmits the packet encrypted with the first encryption key to the first radio base station, the first radio base station transmits the packet to the second radio base station by the tunneling, and the second radio base station decapsulates the packet, decrypts the packet with the first encryption key, and then transmits the packet to the mobile station.

Mobile communication system, communication control method, and radio base station

When being triggered by a call setting request that has been made, dummy information that is different from information to be transmitted and is information used for creating a path on which encrypted communication is to be performed is generated. The path on which the encrypted communication is to be performed is established by using the generated dummy information. A responding process of responding to the call setting request is performed after the path on which the encrypted communication is to be performed has been established. Thus, in the case where information that is obtained after the responding process of responding to the call setting request is encrypted and transmitted, it is possible to transmit the information while maintaining the real-time characteristics of the information to be transmitted.

Packet transmitting and receiving apparatus and packet transmitting and receiving method

A packet is transmitted from a transmitting device to an active communication device which transmits a reception history identifying the received packets to the transmitting device. The transmitting device transmits an active-mode request message to a standby communication device when having failed to receive the reception history from the active communication device within a predetermined time period. Then, the standby communication device becomes a new active communication device, and the active communication device becomes an old active communication device. The new active communication device transmits to the transmitting device a switching request message for switching a destination of the packet from the old active communication device to the new active communication device. The transmitting device retransmits packets that have been transmitted from the transmitting device to the old active communication device and have failed to be received by the old active communication device, to the new active communication device.

Apparatus and method for switching between redundant communication devices

This is a method for transmitting packets. The transmission method includes measuring a time taken for feedback indicating that a packet including context information has been lost; and switching between a first mode and a second mode based on the measured time taken for the feedback, the first mode being a mode for periodically transmitting a packet including the context information and the second mode being a mode for transmitting a packet including the context information in response to the feedback indicating that a packet including the context information has been lost.

Packet transmission method and nodes

Portable telephone

Growing community of inventors

Yokohama, Japan

Isamu Fukuda