This paper describes the REAP (Remote Evaluation in Application-level Protocols) toolkit, a reusable solution for enabling evaluation in such protocols. By using this toolkit, server developers can reduce the number of bytes sent/received and round-trip times used by their protocols to fulfill a user task, making them more efficient in high-latency, low-bandwidth networks. This is accomplished by allowing the clients to upload simple mobile procedures to the server to be executed locally. This paper provides an overview of the REAP toolkit design and architecture, and gives experimental results showing significant reduction in the latency of two popularly-used application-level protocols.

OceanStore is a utility infrastructure designed to span the globe and provide continuous access to persistent information. Since this infrastructure is comprised of untrusted servers, data is protected through redundancy and cryptographic techniques. To improve performance, data is allowed to be cached anywhere, anytime. Additionally, monitoring of usage patterns allows adaptation to regional outages and denial of service attacks; monitoring also enhances performance through pro-active movement of data. A prototype implementation is currently under development.

The widespread deployment of inexpensive communications technology, computational resources in the networking infrastructure, and network-enabled end devices poses an interesting problem for end users: how to locate a particular network service or device out of hundreds of thousands of accessible services and devices.This paper presents the architecture and implementation of a secure Service Discovery Service (SDS).Service providers use the SDS to advertise complex descriptions of available or already running services, while clients use the SDS to compose complex queries for locating these services.Service descriptions and queries use the extensible Markup Language (XML) to encode such factors as cost, performance, location, and device-or service-specific capabilities.The SDS provides a highlyavailable, fault-tolerant, incrementally scalable service for locating services in the wide-area.Security is a core component of the SDS and, where necessary, communications are both encrypted and authenticated.Furthermore, the SDS uses an hybrid access control list and capability system to control access to service information.