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- Nachgewiesen in: USPTO Patent Grants
- Sprachen: English
- Patent Number: 8,578,177
- Publication Date: November 05, 2013
- Appl. No: 12/717458
- Application Filed: March 04, 2010
- Assignees: Kabushiki Kaisha Toshiba (Tokyo, JP)
- Claim: 1. A memory device, comprising: a storage; and a controller, wherein the controller is embedded with controller key data and value data during a manufacturing process, the value data being unique to the controller, the controller is configured to decrypt encrypted private key data using the controller key data, the encrypted private key data being generated by encrypting private key data using the controller key data outside the controller, the controller is configured to generate the private key data by decrypting the encrypted private key data using the controller key data, encrypt the private key data using controller unique key data, and generate the controller unique key data by performing a calculation in which the value data and the controller key data are input to a one-way function, the controller is configured to generate new encrypted private key data by encrypting the private key data using the controller unique key data, and write the new encrypted private key data in the storage, the controller is configured to receive the private key data from outside of the controller in a key data set as a group of key data provided as a private key, the private key data is encrypted by a first vendor using the controller key data, the controller key data is embedded in the controller by a second vendor that manufactures the controller, the second vendor being different from the first vendor, and the value data and the encrypted private key data are inputted to the controller.
- Claim: 2. The memory device according to claim 1 , wherein the controller is configured to write the new encrypted private key data to the storage together with information specifying the private key data uniquely.
- Claim: 3. The memory device according to claim 2 , wherein the controller is configured to certify information obtained from outside the memory device.
- Claim: 4. A memory device, comprising: a controller; and a storage, wherein the controller is embedded with controller key data and value data during a manufacturing process, the controller is configured to decrypt encrypted private key data using the controller key data, the encrypted private key data being generated by encrypting private key data using the controller key data outside the controller, the controller is configured to generate the private key data by decrypting the encrypted private key data using the controller key data, encrypt the private key data using controller unique key data, and generate the controller unique key data by performing a function calculation using the value data and the controller key data as inputs, the controller is configured to generate new encrypted secret key data by encrypting in the controller the private key data using the controller unique key data, and write the new encrypted secret key data in the storage, the private key data is encrypted by a first vendor using the controller key data, the controller key data is embedded to the controller by a second vendor that manufactures the controller, the second vendor being different from the first vendor, and the value data and the encrypted private key data are inputted to the controller.
- Claim: 5. The memory device according to claim 4 , wherein the controller is configured to generate the controller unique key data by performing a calculation in which the value data and the controller key data are input to a one-way function.
- Claim: 6. The memory device according to claim 4 , wherein the controller is configured to receive information from the second vendor, the information being key data set information as a group of key data provided as a private key, and the key data set information is provided to the controller after being generated in the second vendor.
- Claim: 7. A memory device, comprising: a storage; and a controller, wherein the controller is embedded with controller key data and value data unique to the controller, and the storage is written with encrypted private key data, the encrypted private key data being generated by encrypting private key data using the controller key data outside the controller, decrypting the private key data in the controller, and then encrypting the private key data using unique key data that is based on the controller unique key data and the value data, the private key data is encrypted by a first vendor using the controller key data, the controller key data is embedded to the controller by a second vendor that manufactures the controller, the second vendor being different from the first vendor, the value data and the encrypted private key data are inputted to the controller, the unique key data is generated by performing a calculation in which the value data and the controller key data are input to a one-way function, and the encrypted private key data generated by using the unique key data is written in the storage together with information specifying the private key data uniquely.
- Current U.S. Class: 713/193
- Patent References Cited: 7065648 June 2006 Kamibayashi et al. ; 2002/0085715 July 2002 Ripley ; 2002/0141577 October 2002 Ripley et al. ; 2005/0081047 April 2005 Kitani ; 2005/0154905 July 2005 Kojima et al. ; 2005/0213767 September 2005 Matsukawa et al. ; 2007/0116268 May 2007 Kasahara et al. ; 2008/0219451 September 2008 Ju et al. ; 2009/0232314 September 2009 Kato et al. ; 2010/0183148 July 2010 Bellwood et al. ; 6-97931 April 1994 ; 2001-14441 January 2001 ; 2004-208088 July 2004 ; 2005-341156 December 2005 ; 2006-198529 August 2006 ; 2006-198529 August 2006 ; 2008-234217 October 2008 ; WO 2008/018457 February 2008 ; WO 2009/045665 April 2009
- Other References:
- Primary Examiner: Patel, Nirav B
- Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
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