• Proceedings of the Korean Information Science Society Conference
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• 1999.10c
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• pp.492-494
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• 1999

클라이언트용 메일 프로그램에 비해 웹 메일 시스템은 일반 사용자에게 인터페이스와 기능적인 면에서 편리함을 제공한다. 그러나 메일 메시지를 전송하고 관리하는 측면에서는 보안상의 취약점을 갖고 있다. 본 논문에서는 메일 메시지를 안전하게 전송하고 편리하게 관리하기 위한 웹 기반의 메일 시스템을 구현하였다. 이 시스템에서는 일반적인 메일 기능과 PGP(Pretty Good Privacy)를 이용한 메시지 암호화 기능, SSL(Secure Socket Layer) protocol을 이용하여 웹 메일 시스템과 웹 브라우저 사이의 메시지 보호 기능 등을 이용하여 클라이언트용 메일 프로그램을 이용하기 위한 설정이 필요 없이 웹 브라우저만을 가지고 안전한 메시지 전송과 관리를 할 수 있도록 하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10c
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• pp.541-543
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• 2002

정보기술의 발전은 디지털 혁명의 근간이 되고 있는 반면, 정보유출ㆍ파괴ㆍ변조 등의 역기능 또한 내포하기 때문에 이러한 정보화의 역기능에 대한 신속한 탐지 및 능동적인 대응이 절실히 요구되고 있는 실정이다. 그러나 기존의 시스템은 침입에 대한 차단을 중심으로 운영되어 왔고, 침입탐지 시스템이라 할지라도 불법 침입에 대한 대응이 단지 경고나 보고 수준에 머물고 있어 능동적인 대응이 없다는 단점이 있다. 따라서 본 논문에서는 리눅스 시스템에서 실시간 침입탐지 시스템인 NIDS를 설계 구현하고, 동일 네트워크 망에서의 여러 호스트들을 통합적으로 관리하기 위하여 M/A 시스템을 설계ㆍ구현하였다. 여기서 NIDS와 M/A 시스템간의 통신은 SSL/TLS 프로토콜을 기반으로 이루어진다. NIDS에서는 Detection Module과 Response Module을 분리하여 구현하였고, 커널 레벨에서 PCAP 라이브러리를 통해 캡쳐된 패킷이 Detection Module에 의해 침입이라 판단되면 Response Module에서 일정 수준의 대응이 가능하도록 구현하였다.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2003.12a
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• pp.356-359
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• 2003

본 논문에서는 제안하는 Grid Computing은 PMI(Privilege Management Infrastructure)를 이용하여 효율적으로 컴퓨팅 파워의 분산 관리하고 네트？의 트래픽을 분산시키는 모델을 제시한다. 또한 Agent 간 통신 및 Agent와 Server 간 통신에서 Soap Protocol과 SSL Protocol을 접목하여 보안 RPC통신을 기반으로 데이터의 무결성과 기밀성을 보장한다. 본 논문에서 제안한 모델은 Agent를 효과적으로 관리하고 네트워크의 트래픽을 감소시킴과 더불어 Grid Computing의 성능이 개선될 것으로 기대된다.

• Journal of the Korea Convergence Society
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• v.11 no.10
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• pp.37-44
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• 2020

Due to the recent COVID 19 pandemic, public institutions are increasingly working from home. Working in public institutions is rapidly changing into a smart work environment where time and space constraints disappear. However, many public institutions currently lack a security model for an efficient smart work environment due to the physical network separation system that separates the Internet network and the business network. Therefore, in this paper, we describe the current limitations for implementing smart work in a physical network separation environment of public institutions, and propose a security model necessary for a work environment to supplement them. As a related study, explain SSL VPN and explain smart work business model through security model research of SDP (Software Defined Perimeter), RDP (Remote Desktop Protocol), and VDI (Virtual Desktop Infrastructure) to overcome the security limitations of SSL VPN. As a result, we intend to propose a security model for a smart work environment suitable for public institutions while complying with the physical network separation security guide.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.26 no.3
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• pp.563-572
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• 2016

Recently, a plenty of credit card payment protocols have been proposed in Korea. Several features of proposed protocols include: using passwords for user authentication in stead of official certificate for authenticity, and no need to download additional security module via ActiveX into user's devices. In this paper, we suggest two new credit card payment protocols that use both SSL(Security Socket Layer) as a standardized secure transaction protocol and password authentication to perform online shopping and payment. The first one is for the case where online shopping mall is different from PG(Payment Gateway) and can be compared to PayPal-based payment methods, and the second one is for the case where online shopping mall is the same as PG and thus can be compared to Amazon-like methods. Two proposed protocols do not require users to perform any pre-registration process which is separate from an underlying shopping process, instead users can perform both shopping and payment into a single process in a convenient way. Also, users are asked to input a distinct payment password, which increases the level of security in the payment protocols. We believe that two proposed protocols can help readers to better understand the recent payment protocols that are suggested by various vendors, and to analyze the security of their payment protocols.

• Journal of KIISE:Computing Practices and Letters
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• v.8 no.2
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• pp.231-239
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• 2002

This paper gives a comprehensive overview of the SSO solution design on the intranet. SSO described in this paper is based on LDAP, PKI and CA. We designed the data structure to hold many various application services by changing the attribute and DN of LDAP DB. We built LDAP DB using the employee records stored in our organization database. LDAP DB is routinely updated from the database. CA Server that depends on PKI is used to issue the certificates. SHTTP based on SSL is used to protect the data between certificate server and the intranet users.

• The Journal of Korean Association of Computer Education
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• v.15 no.1
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• pp.73-85
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• 2012

Presently, Enhanced electronic financial service are offered used open network due to development of IT and financial transactions. The protocol in this environments such as SET, SSL/TLS, and so on are electronic transaction protocol to perform electronic payment securely and efficiently. However, most users still does not know accurately how to use and potential problems. It especially has key management problem about generate session key for purchase products or payment. To solve this problem, we propose proxy re-encryption based secure electronic transaction to transmit payment and order information without addition session key.

• Annual Conference of KIPS
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• 2013.11a
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• pp.672-675
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• 2013

FTP(File Transfer Protocol)는 호스트에서 다른 호스트로 파일을 전송하기 위한 프로토콜로써, 데이터를 평문으로 전송하기 때문에 기밀성이 보장되지 않는다. 현재 보안 기능이 제공되는 FTP로 FTPS(FTP over SSL)가 있다. FTPS는 TLS(Transport Layer Security)와 SSL(Secure Socket Layer) 암호화 프로토콜 기반에서 동작하는 FTP 이다. 따라서 FTPS는 TLS와 SSL과 같은 추가적인 시스템이 반드시 필요한 단점이 있다. 본 논문에서는 추가적인 암호화 프로토콜 없이 FTP 내에서 보안 기능을 제공하는 Secured FTP를 제안하였다. 본 논문에서 제안한 Secured FTP 는 FTP 내에서 Diffie-Hellman 알고리즘을 이용하여 비밀 키를 교환하고 AES(Advanced Encryption Standard)-Counter 알고리즘을 이용하여 FTP 데이터를 암호화 및 복호화하도록 설계하였다. 본 논문에서 제안한 Secured FTP를 Linux 운영체제에서 구현하였고 시험을 통하여 비밀 키가 정상적으로 교환되고, FTP 데이터가 암호화되어 전송되는 것을 확인하였다.

• Journal of the Korea Society of Computer and Information
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• v.12 no.4
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• pp.77-85
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• 2007

Asecure channel provides protection against interception, while an authentication system is created to protect the client and the server from fabrication attacks. This paper proposes a hybrid authentication algorithm, which fixes the lapses problem encountered in the SSL authentication. Also, the Proposed hybrid authentication system has been created to protect the client and the server from modification and fabrication attacks. By using a modified three-way authentication there is no need for a timeserver. thus timestamps are not needed.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.4
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• pp.769-776
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• 2016

TELNET is vulnerable to network attack because it was designed without considering security. SSL/TLS and SSH are used to solve this problem. However it needs additional secure protocol and has no backward compatibility with existing TELNET in this way. In this paper, we have suggested STELNET(Secured Telnet) which supports security functionalities internally so that has a backward compatibility. STELNET supports a backward compatibility with existing TELNET through option negotiation. On STELNET, A client authenticates server by a certificate or digital signature generated by using ECDSA. After server is authenticated, two hosts generate a session key by ECDH algorithm. And then by using the key, they encrypt data with AES and generate HMAC by using SHA-256. After then they transmit encrypted data and generated HMAC. In conclusion, STELNET which has a backward compatibility with existing TELNET defends MITM(Man-In-The-Middle) attack and supports security functionalities ensuring confidentiality and integrity of transmitted data.