Patents by Inventor Seiichi Domyo

Seiichi Domyo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 8627026
    Abstract: Deduplicated backup data of a plurality of generations are aggregated and stored. A storage apparatus is connected via a network to a host system making a content write request and includes a storage unit providing one or more containers composed of a specified storage area, and a back up unit storing the content in the container in accordance with a backup request from the host system; and wherein the backup unit cuts out the content into one or more chunks, detects a duplicate chunk, which is a duplicate of a chunk stored in the container, from the cutout chunks, and additionally writes the chunk, other than the duplicate chunk, to the container where the duplicate chunk is stored.
    Type: Grant
    Filed: August 19, 2011
    Date of Patent: January 7, 2014
    Assignees: Hitachi, Ltd., Hitachi Computer Peripherals Co., Ltd.
    Inventors: Seiichi Domyo, Taketoshi Sakuraba, Hidehisa Arikawa
  • Publication number: 20130046944
    Abstract: Deduplicated backup data of a plurality of generations are aggregated and stored. A storage apparatus is connected via a network to a host system making a content write request and includes a storage unit providing one or more containers composed of a specified storage area, and a back up unit storing the content in the container in accordance with a backup request from the host system; and wherein the backup unit cuts out the content into one or more chunks, detects a duplicate chunk, which is a duplicate of a chunk stored in the container, from the cutout chunks, and additionally writes the chunk, other than the duplicate chunk, to the container where the duplicate chunk is stored.
    Type: Application
    Filed: August 19, 2011
    Publication date: February 21, 2013
    Applicants: HITACHI COMPUTER PERIPHERALS CO., LTD., HITACHI, LTD.
    Inventors: Seiichi Domyo, Taketoshi Sakuraba, Hidehisa Arikawa
  • Patent number: 7711714
    Abstract: A method and a device for managing a computer network, especially a technique for ensuring the security of a network. A computer network system in which computers are connected to each other through transmission lines, each computer stores the data which constitutes a moving type software exclusively used for security and transmitted together with a message when the computer transmits the message to another computer of the system, and executes the moving type software by using the stored data upon receiving a message from another computer.
    Type: Grant
    Filed: September 1, 2006
    Date of Patent: May 4, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Kazuo Takaragi, Seiichi Domyo, Hiroshi Yoshiura
  • Patent number: 7149930
    Abstract: The present invention provides a disk unit suitable for recording and reproducing time-series continuous data such as AV data. When data received as data to be written into recording medium is audio and/or video data, (this data is called AV data hereinafter), address information 403c identifying a beginning sector of the recording medium in which the data has been written is registered in file control information 402. Also, it is determined whether or not the AV data is contiguous with AV data just before written. If it is contiguous, the beginning sector is not registered in control information storage means. Thus continuous data can be handled as one piece of data.
    Type: Grant
    Filed: October 31, 2002
    Date of Patent: December 12, 2006
    Assignee: Hitachi Global Storage Technologies Japan, Ltd.
    Inventors: Hitoshi Ogawa, Seiichi Domyo, Yukie Hiratsuka
  • Patent number: 7139759
    Abstract: A method and a device for managing a computer network, especially a technique for ensuring the security of a network. A computer network system in which computers are connected to each other through transmission lines, each computer stores the data which constitutes a moving type software exclusively used for security and transmitted together with a message when the computer transmits the message to another computer of the system, and executes the moving type software by using the stored data upon receiving a message from another computer.
    Type: Grant
    Filed: July 3, 2001
    Date of Patent: November 21, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Kazuo Takaragi, Seiichi Domyo, Hiroshi Yoshiura
  • Patent number: 7073037
    Abstract: An information recording/reproducing system in which a host system making access to a magnetic disk apparatus can be limited to a specific one. A magnetic disk apparatus includes an authentication key generating block for generating an authentication key on the basis of physical characteristic(s) of the magnetic disk apparatus itself. The magnetic disk apparatus and the host system have, respectively, authentication key recording block for recording the authentication key and authentication data generating block for generating authentication data on the basis of the authentication key. Access from the host system to information of the magnetic disk apparatus is controlled based on the authentication data of the host system and the authentication data of the magnetic disk apparatus.
    Type: Grant
    Filed: June 24, 2003
    Date of Patent: July 4, 2006
    Assignee: Hitachi Global Storage Technologies Japan, Ltd.
    Inventors: Atsushi Okuyama, Seiichi Domyo, Hitoshi Ogawa, Kazuaki Usui
  • Publication number: 20040030650
    Abstract: An information recording/reproducing system in which a host system making access to a magnetic disk apparatus can be limited to a specific one. A magnetic disk apparatus includes an authentication key generating block for generating an authentication key on the basis of physical characteristic(s) of the magnetic disk apparatus itself. The magnetic disk apparatus and the host system have, respectively, authentication key recording block for recording the authentication key and authentication data generating block for generating authentication data on the basis of the authentication key. Access from the host system to information of the magnetic disk apparatus is controlled based on the authentication data of the host system and the authentication data of the magnetic disk apparatus.
    Type: Application
    Filed: June 24, 2003
    Publication date: February 12, 2004
    Inventors: Atsushi Okuyama, Seiichi Domyo, Hitoshi Ogawa, Kazuaki Usui
  • Publication number: 20030237024
    Abstract: The present invention provides a disk unit suitable for recording and reproducing time-series continuous data such as AV data.
    Type: Application
    Filed: October 31, 2002
    Publication date: December 25, 2003
    Inventors: Hitoshi Ogawa, Seiichi Domyo, Yukie Hiratsuka
  • Publication number: 20020016928
    Abstract: A method and a device for managing a computer network, especially a technique for ensuring the security of a network. A computer network system in which computers are connected to each other through transmission lines, each computer stores the data which constitutes a moving type software exclusively used for security and transmitted together with a message when the computer transmits the message to another computer of the system, and executes the moving type software by using the stored data upon receiving a message from another computer.
    Type: Application
    Filed: July 3, 2001
    Publication date: February 7, 2002
    Inventors: Kazuo Takaragi, Seiichi Domyo, Hiroshi Yoshiura
  • Patent number: 6311277
    Abstract: A method and a device for managing a computer network, especially a technique for ensuring the security of a network. A computer network system in which computers are connected to each other through transmission lines, each computer stores the data which constitutes a moving type software exclusively used for security and transmitted together with a message when the computer transmits the message to another computer of the system, and executes the moving type software by using the stored data upon receiving a message from another computer.
    Type: Grant
    Filed: September 22, 1998
    Date of Patent: October 30, 2001
    Assignee: Hitachi, Ltd.
    Inventors: Kazuo Takaragi, Seiichi Domyo, Hiroshi Yoshiura
  • Patent number: 6272225
    Abstract: A key recovery condition encryption apparatus includes a hashing unit, a first concatenating unit, and a condition information encryption unit. The hashing unit calculates a hash value on the basis of a hash function using a key recovery information text serving as information necessary for performing key recovery. The first concatenating unit concatenates the hash value from the hashing unit to the key recovery condition. The condition information encryption unit encrypts a concatenating result from the first concatenating unit by using a first encryption key. Also is disclosed a key recovery condition decryption apparatus for decrypting the encrypted data from the above encryption apparatus.
    Type: Grant
    Filed: July 7, 1998
    Date of Patent: August 7, 2001
    Assignees: NEC Corporation, Hitachi Limited, Fujitsu Limited
    Inventors: Hiroshi Miyauchi, Kazue Sako, Masashi Yamazaki, Seiichi Domyo, Hiroyoshi Tsuchiya, Seiko Kanno, Ichirou Morita, Naoya Torii, Hiroyuki Ando, Yasutsugu Kuroda
  • Patent number: 6266421
    Abstract: The present invention has an object to overcome problems of a key recovery system using a conventional KRF system and to achieve efficient operation of the overall key recovery system. A key recovery system of the present invention includes check units 12a, 12b for checking whether a user has a recovery authorization for a common key KS, on the basis of a recovery condition RC specified by a recovery condition index RCI which is added to an encrypted message (encrypted message obtained by encrypting the common key KS with a public key KRCpub) supplied from a terminal (10a to 10d) of the user concerned, and a key recovery control unit 14 which is provided separately from the check units 12a, 12b and decrypts the encrypted message with a private key KRCpri paired with the public key KRCpub to recover the common key. The check unit 12a, 12b supplies the common key KS recovered in the key recovery control unit 14 to the user concerned only when the user has the recovery authorization.
    Type: Grant
    Filed: July 7, 1998
    Date of Patent: July 24, 2001
    Assignees: Hitachi, LTD, NEC Corporation, Fujitsu Limited
    Inventors: Seiichi Domyo, Hiroyoshi Tsuchiya, Seiko Kanno, Hiroyuki Ando, Ichirou Morita, Yasutsugu Kuroda, Naoya Torii, Hiroshi Miyauchi, Kazue Sako, Masashi Yamazaki
  • Patent number: 6185308
    Abstract: 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 device which decrypts the encrypted data distributes the key recovery information to key recovery devices through the key recovery information distribution device to recover key information. A recoverer is authenticated directly between the key recovery device and the recoverer device, and then the key information is transmitted to the recoverer device, and the recoverer device recovers the data key.
    Type: Grant
    Filed: March 26, 1998
    Date of Patent: February 6, 2001
    Assignees: Fujitsu Limited, NEC Corporation, Hitachi, Ltd.
    Inventors: Hiroyuki Ando, Ichir{overscore (o)}u M{overscore (o)}rita, Yasutsugu Kuroda, Naoya Torii, Masashi Yamazaki, Hiroshi Miyauchi, Kazue Sako, Seiichi Domyo, Hiroyoshi Tsuchiya, Seiko Kanno
  • Patent number: 6118874
    Abstract: 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 public key is used to encrypt the common key and attached to an encrypted text is provided. In the present invention, only the common key is decrypted to recover the secret without reconstruction of split secret keys kept in a plurality of key storage apparatuses.
    Type: Grant
    Filed: March 30, 1998
    Date of Patent: September 12, 2000
    Assignees: Hitachi, Ltd., Fujitsu Limited, Eiji Okamoto, Masahiro Mambo
    Inventors: Eiji Okamoto, Masahiro Mambo, Seiichi Domyo, Hiroyoshi Tsuchiya, Tooru Kawai, Kazuo Takaragi, Naoya Torii, Takeshi Tanida
  • Patent number: 5872530
    Abstract: In a data compression method using dictionaries, there are adopted a dynamic dictionary and a static dictionary to prevent the deterioration in the data compression ratio in the leading portion of the input data which cannot be efficiently compressed using the dynamic dictionary. Moreover, the configuration removes the disadvantage of the deterioration in the data compression ratio because character strings having a low appearance frequency occupy a large portion of the dictionary. Data to be compressed is inputted via an input unit to be decomposed into input bit strings 202. Using the input bit string as a retrieval key, a bit string retrieval is conducted through the static dictionary by a decision unit and a reference unit.
    Type: Grant
    Filed: January 28, 1997
    Date of Patent: February 16, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Seiichi Domyo, Hiroshi Yoshiura, Yoshiaki Hattori, Yutaka Otsu, Hiromasa Murakami
  • Patent number: 5559984
    Abstract: A distributed file system in which the cache hit ratio of a client is enhanced to speed up a file access for each of users logging into the client. A file server includes an access frequency database in which the names of users are listed in association with the names of files that are frequently accessed by the individual users. Each client includes a log-in user table for entering the name of a user who is logging in, and a cache priority control module. The cache priority control module sets priority levels for the copies of the files stored in a cache area, on the basis of the contents of the access frequency database and the log-in user table. The set priority levels function as criteria when any of the file copies is to be expelled from the cache area. Owing to this construction, the copies of the files of high usage frequencies are preferentially kept in the cache area of the client for each user logging into this client, whereby the cache hit ratio can be enhanced to speed up the file access.
    Type: Grant
    Filed: September 28, 1994
    Date of Patent: September 24, 1996
    Assignee: Hitachi, Ltd.
    Inventors: Hirohiko Nakano, Seiichi Domyo, Takaki Kuroda, Naofumi Shouji, Atsushi Kobayashi
  • Patent number: 5361349
    Abstract: An object management system is equipped with a single real object management system for managing a real file object such as data and a program based on a real directory object in a hierarchical structure, and also at least a single virtual object management system for managing a virtual file object corresponding to said file object based upon a virtual directory object which is independent of the directory object in a hierarchical structure.
    Type: Grant
    Filed: November 22, 1991
    Date of Patent: November 1, 1994
    Assignee: Hitachi, Ltd.
    Inventors: Yumiko Sugita, Hisashi Hashimoto, Masaki Tsuruki, Seiichi Domyo