• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.844-847
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• 2011

Wireless mesh network (WMN) is a type of mobile ad-hoc network consists of wireless router, mobile clients and gateway which connects the network with the Internet. To provide security in the network it is required to encrypt the message sent among the communicating nodes in such way so that only legitimate user can retrieve the original data. Several security mechanisms have been proposed so far to enhance the security of WMN. However, there still exists a need for a comprehensive mechanism to prevent attacks in data communication. Considering the characteristic of mesh network, in this paper we proposed a public key cryptography based security architecture to establish a secure key agreement among communicating nodes in mesh network. The proposed security architecture consists of two major sections: client data protection and network data protection. Client data protection deals with the mutual authentication between the client and the access router and provide client to access router encryption for data confidentiality using standard IEEE 802.11i protocol. On the other hand, network data protection ensures encrypted routing and data transfer in the multi hop backbone network. For the network data protection, we used the pre-distributed public key to form a secure backbone infrastructure.

• Journal of the Korean Data and Information Science Society
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• v.28 no.1
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• pp.163-171
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• 2017

With the advance of function of smart phone system and internet services, mobile trade grows more popular in the area of e-business or banking. These environmental changes, it makes the needs of authorized certificates. Authorized certificate is not only important in these days but also future society. In 2015, 27 millions of Korean people used public key certificate, but most of them does not know the details on the public key certificate. Therefore, in this paper, we explain and investigate the characteristics on the public certificate and explain the relation ship between authorized certificate and public key encrytion. By investigating several papers, internet data, newspapers and books, we found the historical changes, substantial aspects, the encryption systems on the authorized certificate. Also we study the pros and cons of authorized certificate. Finally we predict the number of issued authorized certificate for the future society based on nonparametric statistical method.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.4 no.3
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• pp.671-679
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• 2000

In this study, the messages sent at application layer are encrypted by using RSA Public Keys before sending. Then we developed the information security system devised for the secure WWW data transmission by extending the functions of the Netscape browser and by using application programs such as Java applications and by using the plug-in methods. Not only can these technologies reduce and make it easier to perform key management or encryption transmission process, but they can also reduce the processing time of encryption correspondence.

• Journal of the Korean Institute of Telematics and Electronics
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• v.20 no.5
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• pp.8-15
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• 1983

The use of conventional encryption algorithm or public-key encryption algorithm in existing computer networks can protect information on communication links which are subject to wiretapping. This paper presents the CP-cryptosystem of high system security by using both of these two algorithms in multiuser computer networks. It is proved by the protocols pro-posed in this paper that all of users in the CP-cryptosystem can not only communicate with others secretly but also affix their digital signature.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.11 no.5
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• pp.31-42
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• 2001

Two important requirements in broadcast encryption schemes are traitor traceability and revocability. In this paper, we propose a new type of a traitor tracing scheme that can revoke an unlimited number of traitors\` personal keys. Additionally, we propose an efficient and simple method to provide self-enforcement property. We also describe a variant of our scheme of which encryption algorithm is secure against adaptive chosen ciphertext attacks.

• Journal of Internet Computing and Services
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• v.6 no.3
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• pp.1-16
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• 2005

This paper propose not only MDIT(Mobile Digital Investment Trust) agent design for Trust Investment under Mobile E-commerce environment, but also the symmetric key algorithm 3BC(Bit, Byte and Block Cypher) and the public encryption algorithm F2mECC for solving the problems of memory capacity, CPU processing time, and security that mobile environment has. In Particular, the MDIT Security Agent is the banking security project that introduces the concept of investment trust in mobile e-commerce, This mobile security protocol creates a shared secrete key using F2mECC and then it's value is used for 3BC that is block encryption technique. The security and the processing speed of MDIT agent are enhanced using 3BC and F2mECC.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.05a
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• pp.469-472
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• 2003

The computational cost of encryption is a barrier to wider application of a variety of data security protocols. Virtually all research on Elliptic Curve Cryptography(ECC) provides evidence to suggest that ECC can provide a family of encryption algorithms that implementation than do current widely used methods. This efficiency is obtained since ECC allows much shorter key lengths for equivalent levels of security. This paper suggests how improvements in execution of ECC algorithms can be obtained by changing the representation of the elements of the finite field of the ECC algorithm. Specifically, this research compares the time complexity of ECC computation eve. a variety of finite fields with elements expressed in the polynomial basis(PB) and normal basis(NB).

• Journal of Digital Convergence
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• v.14 no.2
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• pp.175-181
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• 2016

Cloud storage servers do not detect duplication of conventionally encrypted data. To solve this problem, convergent encryption has been proposed. Recently, various client-side deduplication technology has been proposed. However, this propositions still cannot solve the security problem. In this paper, we suggest a secure source-based deduplication technology, which encrypt data to ensure the confidentiality of sensitive data and apply proofs of ownership protocol to control access to the data, from curious cloud server and malicious user.

• Proceedings of the Korea Multimedia Society Conference
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• 2000.04a
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• pp.103-106
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• 2000

본 논문에서는 키 교환 단계없이 비대칭키 암호 알고리즘을 사용하여 대량의 메시지를 암호화하여 전송하는 기법을 제안한다. 제안된 기법은 전체 메시지를 스크램블링한 후 스크램블링된 메시지의 일부분만을 공개키 암호 알고리즘을 사용하여 암호화하여 전송한다. 스크램블링 함수로 신상욱[3] 등에 의해 제안된 해쉬함수를 사용한 all-or-nothing 변환을 이용한다. 그리고 제안된 기법에 약간의 추가적인 오버헤드를 부가하여 디지털 서명까지 제공하는 기법을 제안한다.

• Review of KIISC
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• v.9 no.1
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• pp.33-42
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• 1999

본 논문에서는 지금까지 알려진 확률 공개키 암호 방식에 대해서 조사 분석한다. 기존의 결정적(deterministic) 공개키 방식의 문제점을 논하고, 결정적 공개키 방식에서는 이물 수 없는 강한 안전성 개념들을 소개한다. 그리고 결정적 공개키 방식의 문제점을 보완하고 제시된 안전성 개념을 충족시키는 확률 공개키 암호 방식에 대하여 고찰한다. 또한, 조사한 확률 공개키 방식을 종합적으로 비교 분석한다.