Electronic transactions regularly occur between business partners in separate security domains. Trust negotiation is an approach that provides an open authentication and access-control environment for such transactions, but it is vulnerable to malicious attacks leading to denial of service or leakage of sensitive information. This paper introduces an Adaptive Trust Negotiation and Access Control (ATNAC) framework to solve these problems. The framework combines two existing systems, TrustBuilder and GAA-API, to create a system with more flexibility and responsiveness to attack than either system currently provides.

Current intrusion detection systems work in isolation front access control for the application the systems aim to protect. The lack of coordination and inter-operation between these components prevents detecting and responding to ongoing attacks in real time, before they cause damage. To address this, we apply dynamic authorization techniques to support fine-grained access control and application level intrusion detection and response capabilities. This paper describes our experience with integration of the Generic Authorization and Access Control API (GAA-API) to provide dynamic intrusion detection and response for the Apache Web Server The GAA-API is a generic interface which may be used to enable such dynamic authorization and intrusion response capabilities for many applications.

Current intrusion detection systems work in isolation from access control for the application the systems aim to protect. The lack of coordination and interoperation between these components prevents detecting and responding to ongoing attacks in real-time before they cause damage. To address this, we apply dynamic authorization techniques to support fine-grained access control and application level intrusion detection and response capabilities. This paper describes our experience with integration of the Generic Authorization and Access Control API (GAA-API) to provide dynamic intrusion detection and response for the Apache Web server. The GAA-API is a generic interface which may be used to enable such dynamic authorization and intrusion response capabilities for many applications.

One of the most difficult problems to be solved by metacomputing systems is to ensure strong authentication and authorization. The problem is complicated since the hosts involved in a metacomputing environment often span multiple administrative domains, each with its own security policy. This paper presents a distributed authorization model used by our resource allocation system, the Prospero resource manager. The main components of our design are extended access control lists (EACLs) and a general authorization and access application programming interface (GAA API). EACLs extend conventional ACLs to allow conditional restrictions on access rights. In the case of the Prospero resource manager, specific restrictions include limits on the computational resources to be consumed and on the characteristics of the applications to be executed by the system, such as name, version or endorser. The GAA API provides a general framework for applications to access the EACLs. We have built a prototype of the system.