Information systems must establish trust to cooperate effectively in open environments. We are developing an agent-based approach for establishing trust, where information systems are modeled as agents that provide and consume services. Agents can help each other find trustworthy parties by providing referrals to those that they trust. We propose a graph-based representation of services for mod...

Few empirical studies have investigated career-related incentives for party membership, including young members. Through the lens of rational choice, we ask what and active members consider when calculating costs benefits membership. We argue a broad understanding incentives, careers outside politics. The study is based on in-depth interviews with 25 in Sweden. Our main finding that interviewee...

A credit network models trust between agents in a distributed environment and enables payments between arbitrary pairs of agents. With their flexible design and robustness against intrusion, credit networks form the basis of several Sybil-tolerant social networks, spam-resistant communication protocols, and payment systems. Existing systems, however, expose agents’ trust links as well as the ex...

To remain competitive, enterprises have to integrate their business processes with their customers, suppliers, and business partners. Increasing collaboration includes not only a global multi-national enterprise, but also an organization with its relationship to and business processes with its business partners. Standards and technologies permit business partners to exchange information, collab...

We show how third-party web trackers can deanonymize users of cryptocurrencies. We present two distinct but complementary attacks. On most shopping websites, third party trackers receive information about user purchases for purposes of advertising and analytics. We show that, if the user pays using a cryptocurrency, trackers typically possess enough information about the purchase to uniquely id...

We present a new commerce protocol that allows customers and merchants to conduct face-to-face creditcard authorizations with a credit card company securely with the option of anonymity for the customer, the merchant, or both. Our protocol guarantees that both parties agree to and know the outcome of each transaction. Our protocol has three advantages over others. First, we need only two Messag...

With the rapid growth of Information and Communication Technology, Electronic commerce is now acting as a new means of carrying out business transactions through electronic means such as Internet environment. To avoid the complexities associated with the digital cash and electronic cash, consumers and vendors are looking for credit card payments on the Internet as one possible time-tested alter...

One of the essential security services needed to safeguard online transactions is fair exchange. In fair exchange protocols two parties can exchange their signatures in a fair manner, so that either each party gain the other’s signature or no one obtain anything useful. This paper examines security solutions for achieving fair exchange. It proposes new security protocols based on the "Certified...

It has been a great relief and pleasure for me to finally see the inaugural issue of the much-anticipated ACM Transactions on Management Information Systems (ACM TMIS) in print and distributed at the recent ICIS meeting in St. Louis, Missouri on December 12–15, 2010. Many thanks to those AEs, advisors, authors, colleagues, and friends who attended our little celebration party at the beautiful c...

A multi-agent marketplace, MAGNET (Multi AGent Negotiation Testbed), is a promising solution for conducting online combinatorial auctions. The trust model of MAGNET is somewhat different from other on-line auction systems, since the marketplace, which mediates all communications between agents, acts as a partiallytrusted third party. In this paper, we identify the security vulnerabilities of MA...