• The Journal of Society for e-Business Studies
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• v.5 no.2
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• pp.127-142
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• 2000

Lately, electronic commerce through the Internet has been rising in attention. An important element in such commerce is EDI. EDI is mainly used with VAN but its use is not common due to the high cost of EDI transfer. Thus, only large corporations with frequent use of EDI are able U benefit from it, To smaller companies that have small usage, EDI is becoming a burden. Considering this fact as well as current changes within the enterprise environment, it is apparent that a new generation of EDI is required. To resolve the problems of VAN EDI, the proposed Internal EDI was implemented. Internet EDI deals with the use of the widely spread Internet instead of VAN. By using Internet EDI, it is possible to reduce the high cost that came when using VAN. There would be no extra transfer cost since transmission will be done through the Internet. Also, electronic commerce that is mostly used today between an individual and a company may grow to become a true electronic commerce between companies.

• Proceedings of the Korea Database Society Conference
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• 2000.11a
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• pp.343-349
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• 2000

The objective of this paper was to cope with the verification of the message transfer protocol that integrates the electronic signature and the distribution and authentication of public key in TCP/IP using Choquet fuzzy integral compapred with fuzzy integral. They were classified into the security technology, the security policy, the electronic document processing, the electronic document transportation and the encryption and decryption keys in its function. The measures of items of the message security protocol were produced for the verification of the implemented document in every function.

• Annual Conference of KIPS
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• 2001.04a
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• pp.445-448
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• 2001

The objective of this paper was to cope with the verification of the message transfer protocol that integrates the electronic signature and the distribution and authentication of public key in TCP/IP using security continuity management Choquet fuzzy integral compared with fuzzy integral. They were classified into the security technology, the security policy, the electronic document processing, the electronic document transportation and the encryption and decryption keys in its function. The measures of items of the message security protocol were produced for the verification of the implemented document in every function.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.16 no.5
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• pp.107-111
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• 2006

We analyze Domingo-Feller's first privacy homomorphism scheme with known-plaintext attack As a result, it is possible to get the secret key if we blow two known plaintext-ciphertext pairs when modulus n is public, and three or more pairs are sufficient when modulus n is secret.

• Annual Conference of KIPS
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• 2011.04a
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• pp.869-870
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• 2011

통신이 발달로 인터넷 망을 이용해 고용량의 데이터를 빠르게 주고받을 수 있게 되었으며, 이로 인하여 데이터를 원격 저장소에 저장하여 언제 어디서든 빠르게 접근할 수 있는 서비스가 발전하게 되었다. 하지만 데이터를 저장하는 서버의 보안 및 서버관리자의 신뢰 문재가 발생하게 되었고, 이를 해결하기위해 서버에 저장되는 데이터의 암호화 및 이를 검색할 수 있는 기술이 필요하게 되었다. 기존의 검색 가능 암호의 경우 이메일 서비스를 기반으로 구성이 되어 하나의 데이터에 많은 키워드를 저장하게 되는 원격 저장소 서비스에 적용하기 어렵다. 또한 필드 기반 검색기능을 제공해 검색이 유연하지 않고 결합 키워드 검색 시 연산의 효율성이 떨어지는 문제점이 존재한다. 따라서 본 논문은 블룸필터를 사용하여 대량의 키워드를 효율적으로 저장 및 검색 할 수 있으며 필드 프리한 결합키워드 검색을 지원하는 공개키 검색 가능 암호 시스템을 제안한다.

• Annual Conference of KIPS
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• 2023.11a
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• pp.183-187
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• 2023

양자 컴퓨터가 빠르게 발전됨에 따라 기존의 공개키 암호들이 기반하고 있는 난제인 소인수분해, 이산로그 문제를 다항 시간 안에 풀 수 있는 Shor 알고리즘에 의해 기존 암호의 보안 강도 약화 및 무력화 시기가 다가오고 있다. NIST에서는 양자 컴퓨터 시대에 대비하여 양자 컴퓨터가 등장하더라도 안전한 암호인 양자내성암호에 관한 공모전을 개최하였다. 양자 컴퓨터 환경에서 암호 분석을 통해 암호의 보안 강도를 확인할 수 있는데, 이를 위해서는 암호를 양자회로로 구현해야한다. 본 논문에서는 NIST PQC 공모전의 4 라운드 후보 알고리즘인 HQC (Hamming Quasi-Cyclic)의 PKE (Public Key Encryption) 버전에 대한 키 생성 및 인코딩 연산 중 핵심 역할을 하는 바이너리 필드 산술과shortened Reed-Solomon 코드의 인코딩 연산에 대한 최적화된 양자회로 구현을 제안하고, 이를 위해 필요한 자원을 추정한다.

• Journal of Advanced Navigation Technology
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• v.16 no.6
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• pp.1014-1023
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• 2012

Recently with improvement of SMART Grid, AMI network security has been affecting the environment for Electric information and communication. The system and communication protection consists of steps taken to protect the AMI components and the communication links between system components from cyber intrusions. The addition of two way communications between SUN and HAN introduces additional risk for unauthorized access to the AMI system. In this paper, we propose new AMI device authentication infrastructure, key establishment and security algorithm based on public key encryption to solve AMI network security problems.

• Journal of the Korea Society of Computer and Information
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• v.25 no.1
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• pp.87-92
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• 2020

Various devices, which are powerful computer and low-performance sensors, is connected to IoT network. Accordingly, applying mutual authentication for devices and data encryption method are essential since illegal attacks are existing on the network. But cryptographic methods such as symmetric key and public key algorithms, hash function are not appropriate to low-performance devices. Therefore, this paper proposes blockchain-based lightweight IoT mutual authentication protocol for the low-performance devices.

• ETRI Journal
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• v.40 no.3
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• pp.396-409
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• 2018

Elliptic curve cryptography (ECC) can achieve relatively good security with a smaller key length, making it suitable for Internet of Things (IoT) devices. DNA-based encryption has also been proven to have good security. To develop a more secure and stable cryptography technique, we propose a new hybrid DNA-encoded ECC scheme that provides multilevel security. The DNA sequence is selected, and using a sorting algorithm, a unique set of nucleotide groups is assigned. These are directly converted to binary sequence and then encrypted using the ECC; thus giving double-fold security. Using several examples, this paper shows how this complete method can be realized on IoT devices. To verify the performance, we implement the complete system on the embedded platform of a Raspberry Pi 3 board, and utilize an active sensor data input to calculate the time and energy required for different data vector sizes. Connectivity and resilience analysis prove that DNA-mapped ECC can provide better security compared to ECC alone. The proposed method shows good potential for upcoming IoT technologies that require a smaller but effective security system.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.10 no.3
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• pp.1229-1248
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• 2016

With the feature of convenience and low cost, remote healthcare monitoring (RHM) has been extensively used in modern disease management to improve the quality of life. Due to the privacy of health data, it is of great importance to implement RHM based on a secure and dependable network. However, the network connectivity of existing RHM systems is unreliable in disaster area because of the unforeseeable damage to the communication infrastructure. To design a secure RHM system in disaster area, this paper presents a Secure VANET-Assisted Remote Healthcare Monitoring System (SVC) by utilizing the unique "store-carry-forward" transmission mode of vehicular ad hoc network (VANET). To improve the network performance, the VANET in SVC is designed to be a two-level network consisting of two kinds of vehicles. Specially, an innovative two-level key management model by mixing certificate-based cryptography and ID-based cryptography is customized to manage the trust of vehicles. In addition, the strong privacy of the health information including context privacy is taken into account in our scheme by combining searchable public-key encryption and broadcast techniques. Finally, comprehensive security and performance analysis demonstrate the scheme is secure and efficient.