Patents by Inventor Tae Joo Chang
Tae Joo Chang 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).
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Patent number: 9613207Abstract: Provided is a technology which creates an autorun file that is used in autorun for preventing the autorun of a USB-based portable storage, thereby allowing an arbitrary user or worm virus not to manipulate the autorun file. A method for preventing autorun of portable storage accesses at least one of a master file table entry of a root directory and a master file table entry of an autorun file, and sets non-autorun in the at least one accessed master file table entry.Type: GrantFiled: August 3, 2010Date of Patent: April 4, 2017Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Hyun Uk Hwang, Ki Bom Kim, Gi Han Kim, Sung Il Lee, Tae Joo Chang, Cheol Won Lee
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Patent number: 9286165Abstract: In a method for recovering a partition using backup boot record information, an unallocated area is separated from a disk or an evidence image. The unallocated area is searched for a location of a backup boot record. Whether is backup boot record of a file system to be detected is present in found sectors is analyzed. If the backup boot record is found to be the backup boot record of the file system desired to be detected as a result of the analysis, it is verified whether the backup boot record is a boot record of a valid partition. If it is verified that the backup boot record is the boot record of the valid partition, a file system of a deleted partition is parsed using the backup boot record and a deleted directory or file is recovered.Type: GrantFiled: August 3, 2013Date of Patent: March 15, 2016Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Hyun-Uk Hwang, Ki-Bom Kim, Seung-Yong Lee, Young-Chan Shin, Tae-Joo Chang
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Patent number: 9164845Abstract: Provided is a technology which searches an unallocated area to quickly extract information on a deleted partition when checking a disk and an evidence image in digital forensic, and adds a recovered partition to a forensic tool as a new partition. For this, the technology has direct access to the sector of a disk or an evidence image which is obtained, limits information search on an unallocated area only to an area satisfying the minimum size in which a partition may be created, changes an LBA-based sector access scheme into a CHS-based sector access scheme, and reads only the sector of a location having the possibility that a boot record exists to search information of a deleted partition, recovering a partition at high speed.Type: GrantFiled: November 27, 2009Date of Patent: October 20, 2015Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Hyun Uk Hwang, Ki Bom Kim, Tae Joo Chang, Cheol Won Lee
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Patent number: 8745100Abstract: Method and apparatus for collecting evidence are provided. An exemplary embodiment enhances accuracy and efficiency of collecting evidence by analyzing link information in the target computer and collecting collection target file. And the exemplary embodiment can collect evidence from a target computer as well as from a remote computer through analyzing the link information in the target computer, identifying the path of collection target file and extracting the target file.Type: GrantFiled: November 27, 2009Date of Patent: June 3, 2014Assignee: Electronics and Telecommunications Research InstituteInventors: Ki Bom Kim, Hyun Uk Hwang, Young Chan Shin, Tae Joo Chang, Cheol Won Lee, Sung Jai Baik
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Patent number: 8729921Abstract: A terminal discriminating apparatus and a terminal discriminating method using the same are provided. The terminal discriminating apparatus includes: a measurement unit for measuring a pull-up voltage and a pull-down voltage of each of candidate terminals to be discriminated; a discriminating unit for comparing the pull-up voltages, pull-down voltages, and the differences between the pull-up voltages and pull-down voltages for the candidate terminals to discriminate the types of the candidate terminals; and an output unit for outputting results of the discrimination of the candidate terminals transferred from the discriminating unit. The types of the candidate terminals can be discriminated by comparing the pull-up voltage, the pull-down voltage, and the differences between the pull-up voltages and the pull-down voltages for the candidate terminals.Type: GrantFiled: September 9, 2010Date of Patent: May 20, 2014Assignee: Electronics and Telecommunications Research InstituteInventors: Seung Jei Yang, Myeong Ryeol Choi, Seung Yong Lee, Nam Deok Cho, Tae Joo Chang, Cheol Won Lee
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Publication number: 20140059313Abstract: In a method for recovering a partition using backup boot record information, an unallocated area is separated from a disk or an evidence image. The unallocated area is searched for a location of a backup boot record. Whether is backup boot record of a file system to be detected is present in found sectors is analyzed. If the backup boot record is found to be the backup boot record of the file system desired to be detected as a result of the analysis, it is verified whether the backup boot record is a boot record of a valid partition. If it is verified that the backup boot record is the boot record of the valid partition, a file system of a deleted partition is parsed using the backup boot record and a deleted directory or file is recovered.Type: ApplicationFiled: August 3, 2013Publication date: February 27, 2014Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Hyun-Uk HWANG, Ki-Bom KIM, Seung-Yong LEE, Young-Chan SHIN, Tae-Joo CHANG
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Publication number: 20120076294Abstract: Provided are an arithmetic method and apparatus for supporting Advanced Encryption Standard (AES) and Academy, Research Institute and Agency (ARIA) encryption/decryption functions. The apparatus includes: a key scheduler for generating a round key using an input key; and a round function calculator for generating encrypted/decrypted data using input data and the round key. Here, the round function calculator includes an integrated substitution layer and an integrated diffusion layer capable of performing both AES and ARIA algorithms.Type: ApplicationFiled: December 6, 2011Publication date: March 29, 2012Applicant: Electronics and Telecommunications Research InstituteInventors: Bon Seok KOO, Gwon Ho RYU, Sang Woon YANG, Tae Joo CHANG
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Patent number: 8094815Abstract: Provided are an arithmetic method and apparatus for supporting Advanced Encryption Standard (AES) and Academy, Research Institute and Agency (ARIA) encryption/decryption functions. The apparatus includes: a key scheduler for generating a round key using an input key; and a round function calculator for generating encrypted/decrypted data using input data and the round key. Here, the round function calculator includes an integrated substitution layer and an integrated diffusion layer capable of performing both AES and ARIA algorithms.Type: GrantFiled: October 25, 2007Date of Patent: January 10, 2012Assignee: Electronics andTelecommunications Research InstituteInventors: Bon Seok Koo, Gwon Ho Ryu, Sang Woon Yang, Tae Joo Chang
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Patent number: 8077864Abstract: Provided is an apparatus for computing a T-function based Stream Cipher (TSC)-4 stream cipher. The apparatus includes: two T-function units; and a nonlinear filter for receiving bits output from the two T-function units and generating an 8-bit output sequence per clock. Each of the T-function units includes: a first register for storing an internal state value of the lower N bits; an N-bit internal state updater for updating the internal state value of the lower N-bits stored in the first register; an intermediate result register for storing an intermediate result value output from the N-bit internal state updater; a second register for storing an internal state value of the upper M bits; and an M-bit internal state updater for updating the internal state value of the upper M bits stored in the second register using the value stored in the intermediate result register.Type: GrantFiled: November 13, 2008Date of Patent: December 13, 2011Assignee: Electronics and Telecommunications Research InstituteInventors: Gwan Ho Ryu, Dong Wook Lee, Bon Seok Koo, Tae Joo Chang
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Publication number: 20110234254Abstract: A terminal discriminating apparatus and a terminal discriminating method using the same are provided. The terminal discriminating apparatus includes: a measurement unit for measuring a pull-up voltage and a pull-down voltage of each of candidate terminals to be discriminated; a discriminating unit for comparing the pull-up voltages, pull-down voltages, and the differences between the pull-up voltages and pull-down voltages for the candidate terminals to discriminate the types of the candidate terminals; and an output unit for outputting results of the discrimination of the candidate terminals transferred from the discriminating unit. The types of the candidate terminals can be discriminated by comparing the pull-up voltage, the pull-down voltage, and the differences between the pull-up voltages and the pull-down voltages for the candidate terminals.Type: ApplicationFiled: September 9, 2010Publication date: September 29, 2011Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Seung Jei YANG, Myeong Ryeol CHOI, Seung Yong LEE, Nam Deok CHO, Tae Joo CHANG, Cheol Won LEE
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Patent number: 8011004Abstract: Provided is an apparatus and method for virtual private network (VPN) communication in a socket level that can be applied in an Internet Protocol version 4(IPv4)/IPv6 complex network, and can process data in a socket level to make a VPN communication apparatus available in many applications requiring more security, as well as a web application, wherein the data is transmitted to and received from any one of the internal device and the external device.Type: GrantFiled: April 21, 2008Date of Patent: August 30, 2011Assignee: Electronics and Telecommunications Research InstituteInventors: Hyo Won Kim, Soo Hyeon Kim, Sun Kang, Tae Joo Chang
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Patent number: 8010802Abstract: Provided is a cryptographic device performing encryption or decryption on input data, and more particularly, a cryptographic device having a session memory bus for communicating with a session memory. The cryptographic device includes: an external session memory for storing cryptographic information on each session; a cryptographic processor for encrypting or decrypting input data using the cryptographic information; an external session memory bus connected to the external session memory and the cryptographic processor; and a Central Processing Unit (CPU) for transferring and receiving data to and from the external session memory via the cryptographic processor. The separate session memory buses allow the cryptographic processor to access a session memory without being disturbed by another device, thereby improving the entire performance of the cryptographic device.Type: GrantFiled: May 13, 2008Date of Patent: August 30, 2011Assignee: Electronics and Telecommunications Research InstituteInventors: Sun Kang, Soo Hyeon Kim, Hyo Won Kim, Tae Joo Chang
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Publication number: 20110099639Abstract: Provided is a technology which creates an autorun file that is used in autorun for preventing the autorun of a USB-based portable storage, thereby allowing an arbitrary user or worm virus not to manipulate the autorun file. A method for preventing autorun of portable storage accesses at least one of a master file table entry of a root directory and a master file table entry of an autorun file, and sets non-autorun in the at least one accessed master file table entry.Type: ApplicationFiled: August 3, 2010Publication date: April 28, 2011Applicant: Electronics and Telecommunications Research InstituteInventors: Hyun Uk HWANG, Ki Bom KIM, Gi Han KIM, Sung Il LEE, Tae Joo CHANG, Cheol Won LEE
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Publication number: 20110055163Abstract: Provided is a technology which searches an unallocated area to quickly extract information on a deleted partition when checking a disk and an evidence image in digital forensic, and adds a recovered partition to a forensic tool as a new partition. For this, the technology has direct access to the sector of a disk or an evidence image which is obtained, limits information search on an unallocated area only to an area satisfying the minimum size in which a partition may be created, changes an LBA-based sector access scheme into a CHS-based sector access scheme, and reads only the sector of a location having the possibility that a boot record exists to search information of a deleted partition, recovering a partition at high speed.Type: ApplicationFiled: November 27, 2009Publication date: March 3, 2011Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Hyun Uk HWANG, Ki Bom KIM, Tae Joo CHANG, Cheol Won LEE
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Publication number: 20110047130Abstract: Method and apparatus for collecting evidence are provided. An exemplary embodiment enhances accuracy and efficiency of collecting evidence by analyzing link information in the target computer and collecting collection target file. And the exemplary embodiment can collect evidence from a target computer as well as from a remote computer through analyzing the link information in the target computer, identifying the path of collection target file and extracting the target file.Type: ApplicationFiled: November 27, 2009Publication date: February 24, 2011Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Ki Bom KIM, Hyun Uk HWANG, Young Chan SHIN, Tae Joo CHANG, Cheol Won LEE, Sung Jai BAIK
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Publication number: 20090328194Abstract: Provided is an apparatus and method for virtual private network (VPN) communication in a socket level that can be applied in an Internet Protocol version 4 (IPv4)/IPv6 complex network, and can process data in a socket level to make a VPN communication apparatus available in many applications requiring more security, as well as a web application.Type: ApplicationFiled: April 21, 2008Publication date: December 31, 2009Inventors: Hyo Won Kim, Soo Hyeon Kim, Sun Kang, Tae Joo Chang
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Publication number: 20090319800Abstract: Provided is a cryptographic device performing encryption or decryption on input data, and more particularly, a cryptographic device having a session memory bus for communicating with a session memory. The cryptographic device includes: an external session memory for storing cryptographic information on each session; a cryptographic processor for encrypting or decrypting input data using the cryptographic information; an external session memory bus connected to the external session memory and the cryptographic processor; and a Central Processing Unit (CPU) for transferring and receiving data to and from the external session memory via the cryptographic processor. The separate session memory buses allow the cryptographic processor to access a session memory without being disturbed by another device, thereby improving the entire performance of the cryptographic device.Type: ApplicationFiled: May 13, 2008Publication date: December 24, 2009Inventors: Sun KANG, Soo Hyeon KIM, Hyo Won KIM, Tae Joo CHANG
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Publication number: 20090147946Abstract: Provided is an apparatus for computing a T-function based Stream Cipher (TSC)-4 stream cipher. The apparatus includes: two T-function units; and a nonlinear filter for receiving bits output from the two T-function units and generating an 8-bit output sequence per clock. Each of the T-function units includes: a first register for storing an internal state value of the lower N bits; an N-bit internal state updater for updating the internal state value of the lower N-bits stored in the first register; an intermediate result register for storing an intermediate result value output from the N-bit internal state updater; a second register for storing an internal state value of the upper M bits; and an M-bit internal state updater for updating the internal state value of the upper M bits stored in the second register using the value stored in the intermediate result register.Type: ApplicationFiled: November 13, 2008Publication date: June 11, 2009Inventors: Gwon Ho RYU, Dong Wook LEE, Bon Seok KOO, Tae Joo CHANG
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Publication number: 20090113220Abstract: An encrypted backup data storage device and a storage system using the same are provided. A backup memory stores at least one of plain-text data and a secret key. A leakage current blocking circuit includes at least one inverter and a complementary metal oxide semiconductor (CMOS) NAND gate circuit and cuts off leakage current paths formed by the lines connected to the battery backup memory.Type: ApplicationFiled: October 24, 2008Publication date: April 30, 2009Inventors: Sang Han LEE, Hae Yong YANG, Tae Joo CHANG, Choon Soo KIM
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Publication number: 20080112560Abstract: Provided are an arithmetic method and apparatus for supporting Advanced Encryption Standard (AES) and Academy, Research Institute and Agency (ARIA) encryption/decryption functions. The apparatus includes: a key scheduler for generating a round key using an input key; and a round function calculator for generating encrypted/decrypted data using input data and the round key. Here, the round function calculator includes an integrated substitution layer and an integrated diffusion layer capable of performing both AES and ARIA algorithms.Type: ApplicationFiled: October 25, 2007Publication date: May 15, 2008Inventors: Bon Seok KOO, Gwon Ho RYU, Sang Woon YANG, Tae Joo CHANG