X.509 Proxy Certificates have been proposed for use in the Grid Security Infrastructure to allow dynamic delegation of rights and single sign-on for end users. We have evaluated proxy certificates to secure a service-oriented architecture for digital content based on Web Services. We describe how support for proxy certificates was implemented in Java through extensions to the Java Cryptography ...

BACKGROUND Death certificates (DC) can provide valuable health status data regarding disease incidence, prevalence and mortality in a community. It can guide local health policy and help in setting priorities. Incomplete and inaccurate DC data, on the other hand, can significantly impair the precision of a national health information database. In this study we evaluated the accuracy of death ce...

This document describes an experimental protocol for publicly logging the existence of Transport Layer Security (TLS) certificates as they are issued or observed, in a manner that allows anyone to audit certificate authority (CA) activity and notice the issuance of suspect certificates as well as to audit the certificate logs themselves. The intent is that eventually clients would refuse to hon...

In this paper, we present a novel approach to delegation in computer systems. We exploit mobile code capabilities of today’s systems to build active certificates: cryptographically signed mobile agents that implement delegation policy. Active certificates arrive at a new combination of properties, including expressivity, transparency, and offline operation, that is not available in existing sys...