HP Labs Technical Reports



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Quantum Cryptology

Lo, Hoi-Kwong

HPL-97-151

Keyword(s): cryptography; cryptanalysis; quantum cryptography; quantum cryptology

Abstract: The contest between code-makers and code-breakers has been going on for thousands of years. Recently, quantum mechanics has made a remarkable entry in the field. On the one hand, it is generally accepted that quantum cryptography can provide absolute security for communications between two users. On the other hand, code-breakers in possession of a quantum computer can easily break popular encryption schemes such as RSA and Data Encryption Standard (DES) which are essentially intractable by any classical computer.

34 Pages

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Tech Reports: HPL-97-167R1: Quality-of-Service Measurements with Model-Based



 

HP Labs Technical Reports



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Quality-of-Service Measurements with Model-Based Management for Networked Applications

Martinka, Joe; Pruyne, Jim; Jain, Mudita

HPL-97-167R1

Keyword(s): distributed application management; manageability; model-based reasoning; scalable measurement; intelligent agents; Java applet instrumentation; quality of service

Abstract: Distributed applications are evolving towards compositions of modular software components with user interfaces based on web browsers. Each of these components provides well-defined services that interact with other components via network. The increase in the complexity of distribution makes it more difficult to manage the end-to-end Quality-of- Service (QoS). The challenge derives in part since different management scopes of network and computing domains need to interact. We address two needs of a management system deployed to diagnose QoS degradation. First, to measure the performance of applications, it needs a low-overhead, scalable system for measuring software components. Second, the performance management system must monitor selected measurements, diagnose QoS degradation, adapt to the environment and integrate with network management systems. We extend our Distributed Measurements System (DMS) into browser-based Java applets to deliver low- overhead and pertinent performance information to a management system. A model-based reasoning engine equipped with "generic" application models uses these measurements to diagnose QoS trends. These models incorporate the notion of composite transactions and the organization of distributed components. We demonstrate QoS monitoring using this architecture on a typical, component-based distributed application deployed in a wide area network.

12 Pages

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