3 research outputs found
Fair and Decentralized Exchange of Digital Goods
We construct a privacy-preserving, distributed and decentralized marketplace
where parties can exchange data for tokens. In this market, buyers and sellers
make transactions in a blockchain and interact with a third party, called
notary, who has the ability to vouch for the authenticity and integrity of the
data.
We introduce a protocol for the data-token exchange where neither party gains
more information than what it is paying for, and the exchange is fair: either
both parties gets the other's item or neither does. No third party involvement
is required after setup, and no dispute resolution is needed.Comment: 10 page
Fair signature exchange via delegation on ubiquitous networks
This paper addresses the issue of autonomous fair signature exchange in emerging ubiquitous (u-) commerce systems, which require that the exchange task be delegated to authorised devices for its autonomous and secure execution. Relevant existing work is either inefficient or ineffective in dealing with such delegated exchange. To rectify this situation, this paper aims to propose an effective, efficient and secure solution to the delegated exchange to support the important autonomy feature offered by u-commerce systems. The proposed work includes a novel approach to symmetric-key based verifiable proxy encryption to make the exchange delegation flexible, efficient and simple to implement on resource-limited devices commonly used in u-commerce systems. This approach is then applied to design a new exchange protocol. An analysis of the protocol is also provided to confirm its security and fairness. Moreover, a comparison with related work is presented to demonstrate its much better efficiency and simplicity