• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.10a
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• pp.491-498
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• 2001

IN this Paper we propose an encryption algorithm for security in data communication. this algorithm acts encryption operation after the compression of data in order to reduce the transmission time and storage an encryption key is generated by using a parameter. as soon as key value is generated the parameter is transmitted and key is recreated every 26 times of parameter changing. the random number which is a constituent unit of encryption key is stored in a table the table is reorganized when the key is generated 40 times in order to intensity the security of encryption key. the encryption of data is made through the operation process of the generated key and sour data and the decryption performs the revers operation of encryption after getting decryption key by searching the transmitted parameter. as this algorithm is performed lastly it is possible to be used in practice.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.2
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• pp.253-256
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• 2005

대칭형 암호 알고리즘의 단점을 보안하기 생겨난 비대칭 암호 알고리즘의 대표적인 알고리즘이 RSA 알고리즘이다. 본 논문에서는 RSA 알고리즘의 공개키와 비밀키를 사용자가 생성하고 Web을 통해 등록할 수 있는 키 관리 시스템을 구현하고, 이를 이용하여 사용자 인증, 암호화, 복호화 하는 과정을 보인다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.40 no.8
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• pp.1597-1605
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• 2015

Password authenticated key exchange (PAKE) is a protocol that a client stores its password to a server, authenticates itself using its password and shares a session key with the server. In multi-server PAKE, a client splits its password and stores them to several servers separately. Unless all the servers are compromised, client's password will not be disclosed in the multi-server setting. In attribute-based encryption (ABE), a sender encrypts a message M using a set of attributes and then a receiver decrypts it using the same set of attributes. In this paper, we introduce multi-server PAKE protocol that utilizes a set of attributes of ABE as a client's password. In the protocol, the client and servers do not need to create additional public/private key pairs because the password is used as a set of public keys. Also, the client and the servers exchange only one round-trip message per server. The protocol is secure against dictionary attacks. We prove our system is secure in a proposed threat model. Finally we show feasibility through evaluating the execution time of the protocol.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.17 no.3
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• pp.206-212
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• 1992

In this paper, a public key cryptosystem for security in computer communication networks is proposed. This is based on the security to a difficulty of factorization. For the proposed public key polynomials and the random intergers, then the ciphertext is computed. The security of proposed public key knapsack cryptosystem is verified with digital simulation.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10a
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• pp.673-675
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• 2001

본 논문에서는 PC, 웹, 모바일 환경을 지원하는 글로벌 Peer-to-Peer 엔진에서 인증, 기밀성 및 무결성을 제공하기 위해 암호화/복호화에 필요한 공개키 쌍의 생성/분배/관리 기능을 지원하는 보안 관리자의 설계에 대하여 기술한다. 기존의 Peer-to-Peer 시스템이 단지 인증기관이 발행한 인증서에 의한 공개키의 분배를 지원하는데 비해 제안된 보안 관리자는 인증서뿐만 아니라 인증서가 아닌 다른 전송매체에 의해 분배된 공개키 또한 저장/관리할 수 있는 기능을 제공한다. 이것은 기존의 시스템이 인증서를 발급 받기 위해서 복잡하고 번거로운 신원 확인과 사용료를 부담하는 것에 비해 간편하게 키를 공유하여 보안을 적용시킬 수 있다. 이를 위해 본 논문에서는 키링(Key Rings)이라는 개념을 도입하는데 이는 각 피어에 해당하는 다수의 공개키/개인키를 저장 및 관리란 수 있는 한 쌍의 자료구조로써 제공된다. 또한 본 논문은 이렇게 저장/관리되는 다수의 공개키를 선택하여 사용하기 위한 알고리즘을 제시한다. 제안된 키 링을 사용하는 방식은 인증서를 사용하는 클라이언트/서버 형태의 Peer-to-Peer 보다 순수한 Peer-to-Peer 모델에 근접한 형태라고 볼 수 있다.

• Journal of Korea Multimedia Society
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• v.6 no.2
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• pp.288-300
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• 2003

As the importance of information security gets recognized seriously, ciphers technology gets used more. Particularly, since public key ciphers are easier to control the key than symmetric key ciphers and also digital signature is easily implemented, public key ciphers are increased used. Nowadays, public key infrastructure is established and operated to use efficiently and securely the public key ciphers. In the public key infrastructure, the user registers at the certificate authority to generate the private key and public key pair and the certificate authority issues the certificate on the public key generated. Through this certificate, key establishment between users is implemented and encryption communication becomes possible. But, control function of session key established in the public key infrastructure is not provided. In this thesis, the certificate issuing protocol to support the key recovery of the session key established during the wireless authentication and key establishment is proposed.

• The Journal of the Korea Contents Association
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• v.8 no.4
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• pp.10-16
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• 2008

Quantity of encrypted data that transmitted through the network are increasing by development of encipherment technology. We have many problems; it is caused by technical development and service increase of user requests. It is necessary that create a many encryption key in one web application system. As a result, service quality comes to be low because of increased network traffic and system overload. There must be a system. That should be improved in secure service quality to process data. This paper describes a new approach for design and implementation of distributed encryption key processing for web application system. In this paper, it is based on distributed encipherment key, for the purpose of confidentially, integrity and authentication. It can prevent system degradation from server's data bottleneck and can improve service quality. For distributed encipherment system, we use java object activation technology. It can service while some distributed server are fail.

• KIPS Transactions on Computer and Communication Systems
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• v.9 no.12
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• pp.307-314
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• 2020

The video surveillance service is being widely deployed around our lives and the service stores sensitive data such as video streams in the cloud over the Internet or the centralized data store in an on-premise environment. The main concerning of these services is that the user should trust the service provider how secure the video or data is stored and handled without any concrete evidence. In this paper, we proposed the approach to protecting video by PKI (public key infrastructure) with a blockchain network. The video is encrypted by a symmetric key, then the key is shared through a blockchain network with taking advantage of the PKI mechanism. Therefore, the user can ensure the sensitive data is always kept secure and traceable in its lifecycle.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.16 no.7
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• pp.651-662
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• 1991

An improved modular multiplication algorithm for RSA type public key cryptosystem and its application to a serial communication cricuit are presented. Correction on a published fast modular multiplication algorithm is proposed and verified thru simulation. Cryptosystem for RS 232C communication protocol isdesigned and prototyped for low speed data exchange between computers. The system adops the correct algoroithm and operates successfully using a small size key.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.9 no.1
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• pp.108-113
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• 2008

A proposed system can decrypt each contents block through a double buffer algorithm which can continually buffer contents by dividing a multimedia contents into some blocks and provides more improved method of encryption than existing system by being not capable of decrypting the whole multimedia contents if one key is exposed. Also, using digital signature and public encryption algorithm for mutual authentication between systems, this paper proposes the system which sends and encrypts symmetric keys for contents encryption through SOAP messages.