• Journal of Korea Multimedia Society
• /
• v.2 no.2
• /
• pp.145-154
• /
• 1999

We are very interested in electronic commerce today, and it will is more developed in the future. In electronic commerce, we can easily purchase a cheap goods like digital data using a micropayment system. Though small value is used in micropayment system, it is important because it has many application. The transaction cost of a micropayment system must be small. Many protocols for the micropayment system are studied, but it's not support user's anonymity. In this paper, we examines the existing micropayment system and proposes a new micropayment protocol that have a anonymity.

• Proceedings of the IEEK Conference
• /
• 2002.07b
• /
• pp.1331-1334
• /
• 2002

Micropayment is an electronic payment system for small value transaction. It needs to use a little amount of resources, such as communication and computation due to its small value. In other words, the processing cost for the micropayment must be less than the value of the payment. Several kinds of transactions are suitable for micropayment, eg. the purchasing of train tickets or digital newspapers. Since micropayment systems are designed for small-amount payment the key factor for any micropayment system design is believed to be the minimization of resource consumption without compromising the standard security. In this paper, we propose an adaptive agent approach to credit-based micropayment system, which employs the concept of dynamic balancing between the resource consumption and the risk in the system. As a result of the dynamic balancing, our system not only solves the problem of global overspending but also uses fewer amount of resources than existing approaches. Our approach limits the amount of money spent by untrusted customers to all merchants. Thus, our approach provides a boundary of the global overspending. In addition, for trusted customers, our approach requires less scale of communication for verifying authorizations than all existing approaches.

• Korean Management Science Review
• /
• v.18 no.1
• /
• pp.69-78
• /
• 2001

An electronic micropayment system, one of electronic payment systems, is suitable especially when a small amount of money is to be paid frequently in order to purchase on-line goods (i.e. database search, software distribution, electronic news service, etc). In addition, since the amount of payment is small, possible damages caused by system failures are lower than other payment system. In this paper, a micropayment protocol in electronic commerce environments on the Internet is proposed, based on the PayWord system. And a micropayment electronic commerce system which executes the protocol proposed is implemented. Unlike the PayWord system, however, the micropayment protocol proposed in this paper is designed in such a way that a merchant does not need to request a payment at the end of every business day since a customer cannot purchase goods beyond length of hash chains, which is specified on a certificate. In addition, the system is able to check the validity as well as the duplicate spending of hash chains. The electronic micropayment system with the proposed protocol is consists of Customers, Merchants, and Brokers. Customers are implemented on Windows NT 4.0 using VC++. Merchants are implemented on Solaris 2.5.1 and gcc 2.8.0 using Netscape Web Server and CGI Methods. HP UX 10.20 is used for Brokers.

• 한국HCI학회:학술대회논문집
• /
• 2009.02a
• /
• pp.315-318
• /
• 2009

A payment system is required to buy various services and micropayment system is demanded for minimizing a frequent payment transaction cost in ubiquitous environment. It is not guarantee that devices are always online and payment system is required a robustness when some of them is offline. To solve this situation other systems use a centralized broker but the problem with most existing micropayment system is the heavy load on the broker. In this paper present a payment system a DHT based Peer-to-Peer micropayment system for ubiquitous environment can use even if payments need not be online and reduce broker's load.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.23 no.6
• /
• pp.1007-1015
• /
• 2013

The automatic payment process of mobile phone micropayment system has not checked user's authentication. That is the structural vulnerability of mobile phone micropayment system. The malicious contents provider can cheat users and payment gateway through abusing the structural vulnerability. The payment gateway applies standard payment module after August, 2012 in order to solve the problem. But the standard payment module also has the vulnerability that makes damage of users. So the purpose of this paper is to suggest efficient improvement of standard payment module for user protection.

• Journal of KIISE:Computing Practices and Letters
• /
• v.15 no.10
• /
• pp.752-760
• /
• 2009

Emerging peer-to-peer systems benefit from the large amount of resources provided by many peers. However, many peer-to-peer systems or applications suffer from malicious peers and it is not guaranteed that peers are always online. Micropayment systems are accounting and charging mechanism for buying services, so we can apply them to solve these problems. In the past the majority of micropayment system uses a centralized broker but the problem with most existing micropayment system is a heavy load on the broker. For instance, when an owner of the coin is offline, the broker delegates the owner and handles payment messages. It occurs frequently because of characteristic of peer-to-peer system and is another load of the broker. In this paper we introduce DPay, a peer-to-peer micropayment system that uses distributed hash table (DHT) for storing encrypted payment messages and increases scalability and reduces the load of broker by removing downtime protocol. We show the idea of real-time double spending detection in DPay and report the results of several evaluations in order to compare DPay and other payment scheme. In simulation result, the load of broker in DPay is reduced by 30% on average of other previous payment scheme. We expect that DPay can apply various peer-to-peer systems because it provides a real-time double spending detection and stores more secure payment messages.

• Journal of the Korea Society of Computer and Information
• /
• v.10 no.3 s.35
• /
• pp.189-199
• /
• 2005

Now it is increasing the necessity for micropayment system according to activation for trade on internet. Because of the reason, it is requesting safety for personal information as well as for payment cost. But current micropayment systems cannot support anonymity or have heavy overheads in payment process. This paper suggests a micropayment system to keep anonymity of users and also to keep payment cost safe. The proposed system is to use blind signature anonymous ID which is combined nonce with an encryption of personal information. It also keeps payment cost of users by reconfirmation payment cost and product from certification and increases the computational efficiency by using secret key and session key instead of public key.

• The KIPS Transactions:PartD
• /
• v.12D no.3 s.99
• /
• pp.499-506
• /
• 2005

A hash chain is a structure organized by hash function with high speed in computation. Systems using the hash chain are using extensively in various cryptography applications such as one-time passwords, server-supported signatures and micropayments. However, the most hash chain based on the system using pre-paid method provides anonymity but has the problem to increase payment cost. In this paper, we propose a new hash chain based on the micropayment system to keep user anonymity safe through blind signature in the withdrawal process of the root value without disclosing privacy information, and to improve efficiency by using secret key instead of public key in the system without the role of certificate.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.27 no.5
• /
• pp.1189-1199
• /
• 2017

With the rapid increase in mobile device users, there are many cyber attacks using SMS messages to infect the mobile device. The monetary demage from those attacks are also increasing. Since those demage are generally related to mobile micropayement systems, we study the details of the incidents on smishing and mobile micropayment. We have identified several limitations of current regulations and laws of them. Thus, we propose new regulations and laws to reduce the financial demage from simishing and to strengthen the security and responsibility of the mobile network operator, payment gateway, and content providers who are participating in the structure of a mobile micropayment systems, such as a regulation for information security evaluation system, several laws for compensation of financial demage within mobile micropayement system.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.10 no.2
• /
• pp.55-66
• /
• 2000

이동컴퓨팅 환경은 기존의 컴퓨팅 환경과는 달리 호스트의 이동성과 무선 통신의 특성을 고려하여야 한다. 기존의 지불시스템들은 이와 같은 특성을 고려하지 않고 설계되었기 때문에 이동컴퓨팅 환경에서 이를 효율적으로 사용할 수 없다 본 논문에서는 이동컴퓨팅 환경에서 소액지불을 위한 새로운 전자지불시스템 AMPS(Atomic Micropayment System)를 제안한다. 이시스템은 고객인 이동 호스트의 연산 부담과 무선 통신 메시지의 수를 최소화하도록 설계되었다 AMPS 는 고객의 요청이 들어오면 대행 서버를 통해 고객을 대신하여 유선망에서 판매자를 상대로 상품거래를 대행하여 준다. AMPS는 소액의 디지털 상품 구매를 위한 지불시스템으로 지불 트랜잭션의 원자성(atomicity)을 보장한다. 또한 판매자와 제 3자로부터 고객의 익명성과 대행 서버가 구매 상품 내역에 대해 알수 없도록 구매 상품의 비밀을 보장한다. AMPS 프로토콜의 안정성과 효율성에 대해서도 분석하였다.