1
Naoya Torii, David B Newman Jr: Key distribution protocol for file transfer in the local area network. Fujitsu, David Newman & Associates, May 17, 1994: US05313521 (102 worldwide citation)

A cryptographic communications apparatus and method for use with a first terminal, a file server, a key distribution center and a communications channel. The method is made simple by using classical-key-encryption algorithms for electronic generation of session keys. The terminal is verified at a ke ...


2
Eiji Okamoto, Masahiro Mambo, Seiichi Domyo, Hiroyoshi Tsuchiya, Tooru Kawai, Kazuo Takaragi, Naoya Torii, Takeshi Tanida: Encrypted data recovery method using split storage key and system thereof. Hitachi, Fujitsu, Eiji Okamoto, Masahiro Mambo, Antonelli Terry Stout & Kraus, September 12, 2000: US06118874 (99 worldwide citation)

When a secret is encrypted and stored, it is necessary to provide a countermeasure for the situation where a key is lost (key recovery system). In the present invention, a key recovery system for an enveloped data format in which a common key is used to encrypt a plaintext (secret) and a user's publ ...


3
Masahiko Takenaka, Naoya Torii, Takayuki Hasebe, Ryota Akiyama: Modular arithmetic operation system. Fujitsu, Nikaido Marmelstein Murray & Oram, March 12, 1996: US05499299 (47 worldwide citation)

A modular arithmetic unit comprises an input register, a multiple computing section, an adder, and a correcting section. There is provided a multiple table in which multiples of a modulo N are stored to correspond with low-order some bits of an input number T in the input register. The low-order som ...


4
Ryota Akiyama, Naoya Torii, Noboru Iwayama, Kenichi Utsumi: Transformation pattern generating device and encryption function device. Fujitsu, Staas & Halsey, April 22, 1997: US05623548 (47 worldwide citation)

In accordance with the present invention, there is provided a transformation pattern generating mechanism comprising: a key input section for inputting a key for encryption; a transformation pattern generating section for generating a transformation pattern for transformation of input data; and an o ...


5
Takayuki Hasebe, Naoya Torii, Noboru Iwayama, Masahiko Takenaka, Masahiro Matsuda: Software charging system and software data utilization permitting device. Fujitsu, Staas & Halsey, June 2, 1998: US05761651 (46 worldwide citation)

A software charging system includes a utilization permitting device for giving permission to use a software storing medium storing ciphered programs or data (software); and an authorization center capable of communicating with the utilization permitting device for setting a utilizable amount, totall ...


6
Takayuki Hasebe, Naoya Torii: Licensee notification system. Fujitsu, Staas & Halsey, August 10, 1999: US05935243 (43 worldwide citation)

There is disclosed a licensee notification system for implementing a software sales system wherein license information for converting to executable form software that is presented to a user in non-executable form is communicated to the user from a management center on condition of payment of a charg ...


7
Noboru Iwayama, Naoya Torii, Takayuki Hasebe, Masahiko Takenaka, Masahiro Matsuda: Method and device for utilizing data content. Fujitsu, Staas & Halsey, November 3, 1998: US05832083 (39 worldwide citation)

The present invention provides a data content utilizing device having data storing section for storing information obtained by encoding data contents and content identification information specifying the data contents, a utilization permitting device for generating utilization permission information ...


8
Hiroaki Kikuchi, Ryota Akiyama, Naoya Torii, Takayuki Hasebe: Enciphered file sharing method. Fujitsu, Staas & Halsey, December 10, 1996: US05584022 (38 worldwide citation)

An enciphered file sharing method is adapted to an area distributed type data processing system in which a plurality of data processing units are coupled via a network and a plurality of users share files while maintaining privacy among the users. The enciphered file sharing method includes the step ...


9
Naoya Torii, Takayuki Hasebe, Ryota Akiyama: Encryption communication system. Fujitsu, Staas & Halsey, June 28, 1994: US05325433 (38 worldwide citation)

An encryption communication system including: a communication center having at least a key information generating unit for generating key generating information used for encryption communication; and a plurality of user computers, each interconnected by a plurality of paths through the communication ...


10
Hiroyuki Ando, Ichir overscore, Yasutsugu Kuroda, Naoya Torii, Masashi Yamazaki, Hiroshi Miyauchi, Kazue Sako, Seiichi Domyo, Hiroyoshi Tsuchiya, Seiko Kanno: Key recovery system. Fujitsu, NEC Corporation, Hitachi, Staas & Halsey, February 6, 2001: US06185308 (34 worldwide citation)

A key recovery information distribution device is provided between a recoverer device and a key recovery device, recovers a data key for the recoverer device, and reduces the load of the recoverer device. Data is encrypted using the data key and stored with key recovery information. The recoverer de ...