• Annual Conference of KIPS
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• 2002.04b
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• pp.1651-1654
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• 2002

이메일의 사용자가 인터넷 빠른 증가에 따라 기하급수적으로 늘어나고 있다. 또한 전자상거래에서 무수한 정보 서비스를 메일 시스템을 이용하여 제공할 때, 빠른 처리를 가능하게 하는 방법이 현안이 되고 있다. 이는 메일 관리 시스템의 SMTP 성능 향상이 이 현안의 핵심이라고 할 수 있는데, 본 연구에서는 전자상거래의 메일 내용의 특성을 고려하여 각각의 클라이언트에게 보내는 내용이 같은 항목 하에 일부 내용만이 바뀌는 수평적 유사성, 보내지는 폼의 전체적인 디자인의 변화나 회사의 정보가 변경되는 수직적 유사성의 특징을 이용한 메일 그룹핑(grouping) 방법을 제안한다.

• Annual Conference of KIPS
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• 2001.04a
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• pp.111-114
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• 2001

기존의 멀티미디어 메일은 대용량 메일이라 개인 사용자에게 그 부담이 크지 않을 수가 없었다. 본 연구에서는 멀티미디어 스트림엔진인 Essence 를 이용하여 동영상 멀티미디어 메일을 전송하는데 필요한 Essence 내에 데이터베이스를 지원하기 위한 DBMedium 개발과 데이터베이스 라이브러리를 개발하기 위한 일련의 과정을 제안하고 있다.

• The Journal of Korean Association of Computer Education
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• v.10 no.3
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• pp.57-66
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• 2007

E-mail system is considered as a most important communication media, which can be used to transmit personal information by internet. But e-mail attack also has been increased by spoofing e-mail sender address. Therefore, this work proposes sender verification faculty for spam mail protection at sender's MTA by using security card for protection forged sender and also for authenticating legal sender. Sender's mail MT A requests security card's code number to sender. Then sender input code number and generate session key after sender verification. Session key is used to encrypt sender's signature and secure message transmission. This work can provide efficient and secure e-mail sender authentication with sender verification and message encryption.

• Journal of KIISE:Computing Practices and Letters
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• v.9 no.1
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• pp.86-94
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• 2003

Certified e-mail system guarantees that recipient will get mail content if and only if mall originator receives a receipt. Unlike previous schemes, Optimistic protocols recently published generate a receipt when it meets the condition that the mail content can be accessed by recliner at any time. So originator cannot assure the delivery of e-mail although he can get a receipt. In this paper, we show some flaws in optimistic protocols and propose improved schemes using delivery deadline. Modified protocols guarantee proof-of-receipt and eliminate the problem mentioned above. Furthermore, proposed modification technique can be applicable to most optimistic protocols and is efficient in the sense that modified schemes do not increase the number of messages.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.7 no.1
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• pp.149-157
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• 2003

Recently, the Internet enhanced by development of IT makes the processing and exchanging of information, As the Internet is sending and receiving digitized documents over the Internet e-mail system. The security of document information is being threated when exchanging digitized documents over an open network such as the Internet. The degree of threat is even higher when sensitive documents are involved Therefore, in this paper, the secure e-mail system on a client is designed and implemented in order to make secure exchanging of digitized documents. By using the public key infrastructure in which encrypted mail transmission, proof of delivery and integrity of the message are garanted, unauthorized manipulation, illegal acquisition and mutual authentication problem can be prevented in order to secure the document information which is crucial and sensible when exchanging the digitized document over the Internet. Futhenmore, by using the SET protocol based on public key cryptography, the secure mail system is designed and implemented in order for the users not having any professional knowledge to deal with the system easily and friendly in GUI environment.

• Journal of IKEEE
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• v.9 no.2 s.17
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• pp.108-114
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• 2005

While E-mail has become an important way of communications in IT societies, it creates various social problems due to increase of spam mails. Even though many organizations and corperations have been doing researches to develop spam mail blocking technologies, more cost and system complexities are required because of varieties of blocking technologies. In case of adopting spam blocking technologies, system reliability largely relies on the False-positive error rate with the order of employing spam blocking filters. In this paper, a False-positive mail recovery technique based on privacy information is proposed and implemented in order to improve the reliability of spam locking filters. Through the implemented prototype, recovery procedure for False-positive mails is verified and the results are summarized and analyzed.

• The Transactions of the Korea Information Processing Society
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• v.7 no.9
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• pp.2903-2912
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• 2000

The paper is a design and implementation of the Hybrid Messaging System as integrating electronic mail system and common mail system based on PKI(Public Key Infrastructure), A user writes mail through Web Browser and sends the mail to Web Server. CGHCommon Gateway Interface) program sends the mail that was received through the Web Sever to Post Office Electronic Mail Server using SMTP(SimpleMail Transfer Protocol), The End Process program of the Hybrid Messaging System in a Post Office fetches the mail from the Post Office Electronic Mail Server using POP3 (Post Office Protocol 3), prints it and deliver it to recipients, Also, the Hybrid Messaging System is able to sign the mail with a sign private key that the Certificate Authority publics for users and encrypts the mail with a public key of the Post Office Web Server.

• The KIPS Transactions:PartB
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• v.15B no.5
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• pp.493-500
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• 2008

Although modern day people gather many data from the network, the users want only the information needed. Using this technology, the users can extract on the data that satisfy the query. As the previous studies use the single data in the document, frequency of the data for example, it cannot be considered as the effective data clustering method. What is needed is the effective clustering technology that can process the electronic network documents such as the e-mail or XML that contain the tags of various formats. This paper describes the study of extracting the information from the user query based on the multi-attributes. It proposes a method of extracting the data such as the sender, text type, time limit syntax in the text, and title from the e-mail and using such data for filtering. It also describes the experiment to verify that the multi-attribute based clustering method is more accurate than the existing clustering methods using only the word frequency.

• The Journal of the Korea Contents Association
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• v.7 no.4
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• pp.20-29
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• 2007

Although E-mail system is considered as a most important communication media, 'Spam' is flooding the Internet with many copies of the same message, in an attempt to force the message on people who would not otherwise choose to receive it. Most spam is commercial advertising, often for dubious products, get-rich-quick schemes, or quasi-legal services. Therefore advanced anti-spam techniques are required to basically reduce its transmission volume on sender mail server or MTA, etc. In this study, we propose a new sender authentication model with encryption function based on modified DomainKey with SMS for Spam mail protection. From the SMS message, we can get secret information used for verification of its real sender on e-mail message. And by distributing this secret information with SMS like out-of-band channel, we can also combine proposed modules with existing PGP scheme for secure e-mail generation and authentication steps. Proposed scheme provide enhanced authentication function and security on Spam mail protection function because it is a 'dual mode' authentication mechanism.

• The KIPS Transactions:PartC
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• v.13C no.2 s.105
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• pp.259-266
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• 2006

As the volume of spam has increased to extreme levels, many anti-spam filtering techniques have been proposed. Among these techniques, the machine-Loaming filtering technique is one of the most popular filtering techniques. In this paper, we propose a machine-learning spam filtering technique based on the neural network, the genetic algorithm and the $X^2$-statistic. This proposed filtering technique is designed to overcome the problems in existing filtering techniques, and to achieve high spam filtering accuracy. It is able to classify spam and legitimate emil with 95.25 percent and 95.31 percent accuracy. This accuracy of the sum filtering is 7.75 percent and the 12.44 percent higher than rule-based filtering and the Bayesian filtering technique, respectively.