Fujitsu Corporation

Takaoki Sasaki

Takayuki Hasebe

Seigo Kotani

Ryota Akiyama

Yasuyuki Tamura

Yusuke Yamanaka

Takeshi Hatano

Yuu Umebayashi

Etsu Den

A gate insulating film and a gate electrode are formed on a silicon substrate. The gate insulating film contains at least hafnium, oxygen, fluorine, and nitrogen. The fluorine concentration is high in the vicinity of an interface with the silicon substrate and progressively decreases with decreasing distance from the gate electrode. The nitrogen concentration is high in the vicinity of an interface with the gate electrode and progressively decreases with decreasing distance from the silicon substrate. The fluorine concentration in the vicinity of the interface with the silicon substrate is preferably 1&#xd7;10cmor more. The nitrogen concentration in the vicinity of the interface with the gate electrode is preferably 1&#xd7;10cmor more.

Method of manufacturing semiconductor device

The authentication system has a signing station and a certifying station. The signing station divides the data to be transmitted into a plurality of data, a hash unit creates a plurality of authenticators by applying a different one-way function to each of the data. In the certifying station, a separating unit divides the data into a plurality of data, a hash unit creates a plurality of authenticators by applying a different one-way function to each data, and a comparing unit compares the authenticators prepared anew with the authenticators separated from the received data and checks the authentication of the data from the comparison.

Authentication system, authentication method, signing apparatus, signing method, certifying apparatus, certifying method, and a computer-readable recording medium with a program making a computer execute the method recording therein

A data protection program is able to effectively restrict an unauthorized access to a resource to be protected even when the resource to be protected is in a state legitimately accessed by a user. The identification information about a program capable of accessing the resource to be protected is registered in an access permission management table. If an access request to access the resource to be protected is subsequently received, then identification information about a request source program which has outputted the access request is acquired. Then, it is determined whether access to the resource to be protected is permitted or not based on whether the identification information about the request source program has been registered in the access permission management table or not. If access to the resource to be protected is permitted, data in the resource to be protected is processed in response to the access request.

Data protection program and data protection method

Semiconductor device

A file processing unit comprises a first signature information producing unit that produces first signature information in accordance with a predetermined rule utilizing the data of a file designated by a file close request issued in an application used in a computer system, and a signature information storage control unit that stores the first signature information, correlated with the file designated by the file close request, in a storage unit.

File processing unit

A cryptographic communication method is provided in which a cryptographic communication is performed by an easy operation even if both enciphered data and unenciphered data are mixed to be handled. In the transmission side, a communication key is used for enciphering data to be transmitted, and in the reception side the same communication key as in the transmission side is used for decoding received data. In the transmission side, an individual key that is different from the communication key is used for enciphering the data to be transmitted, the enciphered data are decoded by using the individual key first, and then the decoded data are enciphered by using the communication key so that the enciphered file can be transmitted.

Cryptographic communication method, file access system and recording medium

In a signature creating apparatus, a clock generates a time stamp and in which time can be set only by a computer installed in a certificate authority center. Further, connecting sections connects an apparatus ID for specifying an apparatus and the time stamp and personal identification information for identifying an implementor to a plain-text so as to create data for the signature. A signature creating circuit encrypts the data for the signature using a signature creating key or the like and generates the signature. A connecting section connects the signature to the data for the signature and transmits the data as data after signature.

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Tokyo, Japan

Takaoki Sasaki