| Patent application number | Description | Published |
|---|
| 20090024852 | GROUP SIGNATURE SYSTEM, METHOD, DEVICE, AND PROGRAM - A signature device | 01-22-2009 |
| 20090034739 | KEY ISSUING METHOD, GROUP SIGNATURE SYSTEM, INFORMATION PROCESSING APPARATUS, AND PROGRAM - There is provided in accordance with the present invention a key issuing method for being performed by a user apparatus in a group signature system including the user apparatus and an issuer apparatus connected to the user apparatus through a network. The method comprises: reading an issuer public key from the issuer apparatus into a user storage through the network; receiving, from the issuer apparatus through the network, first confidential data including one or plural confidential texts which are produced by confidentializing the issuer public key using element data containing information of an element of a group in the issuer apparatus; performing a second confidential data generating process for generating second confidential data of a confidential text represented by the product of modulo-exponentiated element data corresponding to the confidential texts included in the first confidential data or a confidential text represented by the sum of the element data multiplied by a constant, using the issuer public key and the first confidential data; sending the second confidential data to the issuer apparatus through the network; receiving, from the issuer apparatus through the network, information generated in the issuer apparatus and based on the element data corresponding to the second confidential data; and generating a member public key which is a public key corresponding to the user apparatus and a member secret key which is a secret key corresponding to the user apparatus, using the information based on the element data corresponding to the second confidential data, and writing the member public key and the member secret key into the user storage. | 02-05-2009 |
| 20090074188 | MEMBER CERTIFICATE ACQUIRING DEVICE, MEMBER CERTIFICATE ISSUING DEVICE, GROUP SIGNING DEVICE, AND GROUP SIGNATURE VERIFYING DEVICE - It is an object of the present invention to enhance the security and reduce the data amount of data to be handled in a group signing system, in which when the group public key which includes: a description for four groups: group 1, group 2, group T, and group E of the same order number; a description of bilinear mapping from group 1 and group 2 to group T; each generator of group 1, group 2, group T, and group E; and a signature public key of a signature scheme using group 1, group 2, and group T, is input, the member secret key including an integer not larger than the order number, member evidence which is a value given by multiplying the generator of group E by the member secret key, and an element of group 1 or group 2 which is a value given by multiplying the generator of the group 1 or the group 2 by the member secret key are sent to the member-certificate issuing device, and thereafter upon receipt of a signature for the member secret key, which is verifiable by the signature public key, from the member-certificate issuing device, the signature is used as the member certificate. | 03-19-2009 |
| 20090080645 | INTEGRATED SHUFFLE VALIDITY PROVING DEVICE, PROOF INTEGRATING DEVICE, INTEGRATED SHUFFLE VALIDITY VERIFYING DEVICE, AND MIX NET SYSTEM - An integrated shuffle validity proving device ( | 03-26-2009 |
| 20090287926 | PROVING APPARATUS AND VERIFICATION APPARATUS APPLIED TO DENIABLE ZERO-KNOWLEDGE INTERACTIVE PROOF - The present invention enables deniable zero-knowledge interactive proof to be performed with low amounts of communications and calculations by utilizing a method of a special honest verifier zero-knowledge interactive proof when such method is given. The verification apparatus generates a commitment of a challenge value with respect to a predetermined relationship and transmits the commitment of the challenge value to the proving apparatus, which determines whether or not a required relationship using the commitment of the challenge value holds, and stops its operation if such relationship does not hold. The proving apparatus causes the proof commitment generation apparatus to generate a proof commitment and transmits the proof commitment to the verification apparatus, which transmits a challenge value and a random number to the proving apparatus. The ladder transmits a response to the verification apparatus which determines acceptance or non-acceptance of the proof through communications with the interactive proof verification apparatus. | 11-19-2009 |
| 20100020977 | KEY GENERATION DEVICE, KEY DERIVATION DEVICE, ENCRYPTION DEVICE, DECRYPTION DEVICE, METHOD AND PROGRAM - A key generation device ( | 01-28-2010 |
| 20100070768 | KEY EXCHANGE DEVICE, KEY EXCHANGE PROCESSING SYSTEM, KEY EXCHANGE METHOD, AND PROGRAM - A key exchange apparatus according to the present invention includes storage | 03-18-2010 |
| 20100115285 | MIX-NET SYSTEM - Each participant apparatus ( | 05-06-2010 |
| 20100132608 | SILICA GLASS CRUCIBLE FOR PULLING UP SILICON SINGLE CRYSTAL AND METHOD FOR MANUFACTURING THEREOF - A silica glass crucible for pulling up a silicon single crystal including a wall part, a corner part and a bottom part is provided with an outer layer formed from an opaque silica glass layer which includes many bubbles, and an inner layer formed from a transparent silica glass layer which substantially does not include bubbles, wherein at least one part of an inner surface of the wall part and the corner part being an uneven surface formed with multiple damaged parts having a depth of 50 μm or more and 450 μm or less, and wherein a region among the inner surface of the bottom part within a certain range from the center of the bottom part being a smooth surface which does is substantially not formed with damage. | 06-03-2010 |
| 20100170432 | APPARATUS FOR PULLING SILICON SINGLE CRYSTAL - An apparatus for pulling a silicon single crystal, comprising: a crucible that stores a silicon melt; a heater that heats the crucible; a crucible driving unit for rotating and/or lifting up and down the crucible; a chamber that holds the crucible and the heater; and a magnetic field applying unit that is provided outside the chamber and applies a magnetic field to the chamber, wherein the magnetic field applying unit is formed along the outer peripheral surface of the chamber such that substantially concentric circle-shaped equi-strength lines of the magnetic field are formed about a center axis of the crucible. | 07-08-2010 |
| 20100172496 | KEY GENERATING APPARATUS, ENCRYPTING APPARATUS AND DECRYPTING APPARATUS - A calculation device for calculating two groups G and G | 07-08-2010 |
| 20100180119 | KEY EXCHANGING APPARATUS - A key exchanging apparatus transmits the contribution data to the plurality of counterpart apparatuses, generates a signer contribution confirmation signature with respect to a contribution data set including all the contribution data received from the plurality of counterpart apparatuses, generates auxiliary data and auxiliary data validity certification sentence from the contribution data set and the contribution random number, transmits the auxiliary data, the auxiliary data validity certification sentence and the contribution confirmation signature to the plurality of counterpart apparatuses, verifies validity of auxiliary data by using the counterpart identifier set, the counterpart public key set, the contribution confirmation signature set including the data received from the plurality of counterpart apparatuses, the auxiliary data set and the auxiliary data validity certification sentence set, and generates a public key from the contribution data set and the auxiliary data received from the plurality of counterpart apparatuses. | 07-15-2010 |
| 20100199093 | KEY EXCHANGE DEVICE - The present invention includes a section ( | 08-05-2010 |
