The issue of consent in medical care, and its corollary refusal of consent, has become more and more complex. Three major consent issues are: (I) the capacity of giving consent or obtaining consent when the individual involved is impaired or not competent to give consent; (2) the capacity to consent to or authorize non-treatment or withdrawal of treatment; and (3) the refusal to give consent wh...

We describe a generic protocol for fair exchange of electronic goods with non-repudiation. Goods can be signatures (i.e., non-repudiation tokens of public data), confidential data, or payments. The protocol does not involve a third party in the exchange in the faultless case but only for recovery.

This paper develops a framework for wireless security that provides confidentiality, identity authentication, message authentication, integrity, sender non-repudiation, receiver non-repudiation and anonymity. Our framework is based on two physical primitives: collaborative jamming and spatial signature enforcement. Notably, it eschews the use of shared secrets, while providing a cryptosystem th...

In commercial transactions, an intermediary might be involved to help transacting parties to conduct their business. Nevertheless, the intermediary may not be fully trusted. In this paper, we introduce the concept of intermediary (or agent) in a non-repudiation protocol, define the aims of intermediary non-repudiation protocols, and analyze their security requirements. We present a simple scena...