Patent application number | Description | Published |
20090129364 | METHOD FOR TRANSMITTING AND RECEIVING SAFETY MESSAGE - A method for a first mobile station to transmit a safety message to a second mobile station is provided. The first mobile station competitively transmits a non-safety message to the second mobile station during a first period. The first mobile station spreads a safety message and generates a spread message when a second period starts, and transmits the spread message to the second mobile station. Accordingly, safety message transmission delay or data loss in the inter-vehicle communication can be prevented. | 05-21-2009 |
20090161864 | BLOCK CIPHER ARIA SUBSTITUTION APPARATUS AND METHOD - A block cipher ARIA substitution apparatus, the apparatus includes a first Sbox operation unit for performing operations of a substitution box S | 06-25-2009 |
20090316887 | DATABASE ENCRYPTION AND QUERY METHOD KEEPING ORDER WITHIN BUCKET PARTIALLY - A database encryption and query method keeping an order within a bucket partially, which encrypts and stores numeric data in a database, includes calculating a relative value of a plaintext within a bucket to which the plaintext is allocated; generating a first key value by producing a random number within the bucket; generating a second key value for defining a function having a bucket range of the bucket as an input; and changing the relative value based on the first and the second key value with keeping an order of the relative value partially to store the changed relative value. The first key value may be a value of separating order informations on the relative value. Further, the second key value may be a resultant value obtained by applying a mod 2 operation to the bucket size of the bucket. | 12-24-2009 |
20100074440 | HIGH-SPEED PIPELINED ARIA ENCRYPTION APPARATUS - There is provided a high-speed pipelined ARIA encryption apparatus. The high-speed pipelined ARIA encryption apparatus includes a round key generator for generating a plurality of round keys required for performing an encryption operation using a master key formed to have uniform bits, a plurality of round units whose number is in proportion to the number of times of round operations corresponding to the number of bit of an input value to receive the round keys and the input value and to perform the round operations, and a plurality of pipelined register provided between the round units to transmit the output value of a previous round unit as the input value of the next round unit. A plurality of round units are provided and pipelined registers are inserted between the round units so that it is possible to improve the performance of processing a large amount of data and to perform ARIA encryption at high speed. | 03-25-2010 |
20110004765 | LICENSE MANAGING METHOD AND DEVICE - A license managing device sets a security area for storing a license file, maintains the security area as an encoded file in an inactive state of the security area by encoding the security area, maintains the security area as a directory in an active state of the security area by decoding the security area, and encodes a license file by using a file encoding key according to the user's request and stores the same in a security area in an active state of the security area. | 01-06-2011 |
20110154045 | ANONYMOUS AUTHENTICATION SERVICE METHOD FOR PROVIDING LOCAL LINKABILITY - There is provided an anonymous service method of providing local linkability. The anonymous service method providing local linkability according to exemplary embodiments of the invention, an anonymous authentication operation based on a short group signature is performed, for which the concept of a local linkability is introduced to secure linkability within the same service domain. Namely, in the interior of a service provider, a virtual index having a fixed value is calculated for each service user, and in this case, although a plurality of service providers collude with each other, they cannot calculate a virtual index having the same value, whereby the linkability can be secured within the same service domain but not within the interiors of different service domains. | 06-23-2011 |
20120084567 | GROUP SIGNATURE SYSTEM AND METHOD PROVIDING CONTROLLABLE LINKABILITY - A group signature system includes: a key issuer server for generating a first parameter of a group public key, generating a corresponding master issuing key, and issuing a signature key to a user when a user device joins; an opener server for generating a second parameter of the group public key, and a corresponding master opening key and master linking key; and a linker server for checking whether two valid signatures have been linked by using the master linking key when the two signatures corresponding to a group public key are given. The group signature system further includes: a signature verifying unit for confirming a validity of the given signatures and a signer information confirming unit for confirming a validity of singer confirming information generated by the opener server. | 04-05-2012 |
20120099726 | CONTENT PROTECTION APPARATUS AND METHOD USING BINDING OF ADDITIONAL INFORMATION TO ENCRYPTION KEY - The present invention relates to a content protection apparatus and method using binding of additional information to an encryption key. The content protection apparatus includes an encryption unit for creating an encryption key required to encrypt data requested by a user terminal and then generating encrypted data in which the data is encrypted. An additional information management unit manages additional information including authority information about the encrypted data. A White-Box Cryptography (WBC) processing unit generates a WBC table required to bind the encryption key corresponding to the encrypted data to the additional information. A bound data generation unit generates bound data in which the encrypted key is bound to the additional information, using a cipher included in the WBC table. | 04-26-2012 |
20120159166 | METHOD OF VERIFYING KEY VALIDITY AND SERVER FOR PERFORMING THE SAME - Disclosed herein is a method of verifying key validity and a server for performing the method. The method is configured such that a service provision server verifies key validity in an anonymous service for providing local linkability. The service provision server receives a revocation list. A local revocation list is generated using the received revocation list and a secret key. A virtual index of a service user required to verify key validity is calculated. Whether a key of the service user is valid is verified, based on whether the virtual index is included in the local revocation list. | 06-21-2012 |
20120163582 | DATA ENCODING AND DECODING APPARATUS AND METHOD THEREOF FOR VERIFYING DATA INTEGRITY - A data encoding apparatus for verifying data integrity by using a white box cipher includes: an encoding unit for encoding content by using a white box cipher table; and an arithmetic logic unit for performing an arithmetic logic operation on the white box cipher table and content information to output an encoded white box cipher table. The arithmetic logic operation is an exclusive OR operation. The content information is license information of the content or hash value of the license information of the content. | 06-28-2012 |
20120163654 | METHOD AND SYSTEM FOR TRACKING ILLEGAL DISTRIBUTOR AND PREVENTING ILLEGAL CONTENT DISTRIBUTION - A system for tracking an illegal distributor and preventing an illegal content distribution includes: a forensic mark generator for receiving content and a content identification code from a content providing apparatus to generate a forensic mark; a forensic mark database for storing the generated forensic mark; a forensic mark insertion unit for inserting the forensic mark into the content; and a content database for storing the content into which the forensic mark has been inserted. The system further includes a content transmitter for transmitting the content into which the forensic mark has been inserted to the content utilization apparatus. | 06-28-2012 |
20120166309 | AUTHENTICATION SYSTEM AND AUTHENTICATION METHOD USING BARCODES - Disclosed is an authentication method using barcodes. the authentication method includes: converting into a first barcode and outputting, by a first user device, authentication related information provided from a service providing server; receiving, by a second user device, the first barcode; generating, by the second user device, signature information or authentication information on the authentication related information by using a signature key or a certificate; and providing, by the second user device, the signature information or the authentication information to the service providing server. | 06-28-2012 |
20120170740 | CONTENT PROTECTION APPARATUS AND CONTENT ENCRYPTION AND DECRYPTION APPARATUS USING WHITE-BOX ENCRYPTION TABLE - A content protection apparatus using a white-box encryption table includes: a random number generation unit for generating a random number; a white-box encryption table for encrypting the random number and user information provided from a user to generate an encrypted output value; and an operation unit for performing an operation between the encrypted output value and data inputted from an outside to encrypt or decrypt the data. | 07-05-2012 |
20130152189 | AUTHENTICATION METHOD AND APPARATUS FOR DETECTING AND PREVENTING SOURCE ADDRESS SPOOFING PACKETS - An authentication apparatus for detecting and preventing a source address spoofing packet, includes a packet reception unit configured to receive a packet from a previous node or a user host; a self-assurance type ID generation unit configured to generate a self-assurance type ID of a source node of the received packet; and a self-assurance type ID verification unit configured to determine whether the source address of the received packet has been spoofed. Further, the authentication apparatus includes a white list storage unit configured to store a reliable source node; a black list storage unit configured to store an unreliable source node; and a packet transmission unit configured to transmit the packet whose source has been verified through the self-assurance type ID verification unit to a next network node. | 06-13-2013 |
20130273450 | TRI-BLOCK COPOLYMER AND ELECTROLYTE MEMBRANE MADE FROM THE SAME - Provided are a tri-block copolymer and an electrolyte membrane prepared therefrom. The tri-block copolymer has a structure of polar moiety-containing copolymer block/non-polar moiety-containing copolymer block/polar moiety-containing copolymer block, or non-polar moiety-containing copolymer block/polar moiety-containing copolymer block/non-polar moiety-containing copolymer block, and is useful for an electrolyte membrane for fuel cells. The electrolyte membrane for fuel cells prepared from the tri-block copolymer exhibits superior dimensional stability and excellent fuel cell performance. | 10-17-2013 |
20140023949 | Tri-Block Copolymer and Electrolyte Membrane Made from the Same - Provided are a tri-block copolymer and an electrolyte membrane prepared therefrom. The tri-block copolymer has a structure of polar moiety-containing copolymer block/non-polar moiety-containing copolymer block/polar moiety-containing copolymer block, or non-polar moiety-containing copolymer block/polar moiety-containing copolymer block/non-polar moiety-containing copolymer block, and is useful for an electrolyte membrane for fuel cells. The electrolyte membrane for fuel cells prepared from the tri-block copolymer exhibits superior dimensional stability and excellent fuel cell performance. | 01-23-2014 |
20140074387 | METHOD AND APPARATUS FOR AUTHENTICATING GROUP DRIVING OF MOVING OBJECT - A method authenticates a group driving service of a moving object. The method includes authenticating the moving object when an authentication request for the registration of the group driving service is received from the moving object, generating a certain group having group driving service registration information based on group driving registration information when a registration request for the group driving service is received from the moving object, the registration request including the group driving registration information, and transmitting the group driving service registration information of the certain group to the moving object. | 03-13-2014 |