Xerox Corporation

Palo Alto Research Center Inc.

Cristina Lopes

Erik A Hilsdale

John Ogden Lamping

Gregor J Kiczales

James J Hugunin

Diana Kathryn Smetters

Dirk Balfanz

Paul J Stewart

Hao-Chi Wong

Taher H Haveliwala

Venkatesh Choppella

Chandrasekhar Boyapati

Martin Lippert

Pre-authentication information of devices is used to securely authenticate arbitrary peer-to-peer ad-hoc interactions. In one embodiment, public key cryptography is used in the main wireless link with location-limited channels being initially used to pre-authenticate devices. Use of public keys in the pre-authentication data allows for the broadening of types of media suitable for use as location-limited channels to include, for example, audio and infrared. Also, it allows a range of key exchange protocols which can be authenticated in this manner to include most public-key-based protocols. As a result, a large range of devices, protocols can be used in various applications. Further, an eavesdropper is forced to mount an active attack on the location-limited channel itself in order to access an ad-hoc exchange. However, this results in the discovery of the eavesdropper.

Systems and methods for authenticating communications in a network medium

A set of development tools is provided as part of an integrated development environment for supporting aspect-oriented programming such that aspects may easily be defined for embodying functionality which cross-cuts main program functionality in such a way that aspects transparently force their behavior on the main program. The editor and debugger of the integrated development environment embody functionality for accommodating this transparency.

Integrated development environment for aspect-oriented programming

An aspect oriented system for implementing system monitoring and tracing is provided in which the monitoring and tracing functionality needs not be coded into the resources being monitored or traced. Rather, an aspect is provided which encapsulates the monitoring/tracing behavior. This behavior may easily and transparently be forced onto the resource by compiling the object class for the resource along with the monitoring/tracing aspect. When the monitoring/tracing is no longer needed, it is removed simply by recompiling the resource object classes without the aspect.

Aspect-oriented system monitoring and tracing

The concept of a general purpose aspect is introduced where an aspect transparently forces cross-cutting behavior on object classes and other software entities. A reusable aspect is further described for use as part of an aspect library.

Aspect-oriented programming

An aspect oriented system for implementing the Design by Contract software development methodology is provided in which preconditions and postconditions defining the contract need not be coded into the program modules being developed. Rather, an aspect is provided which encapsulates these preconditions and postconditions. This behavior may easily and transparently be forced onto the resource by compiling the object class for the program module along with the contract aspect. When the software program in which the program modules is used is no longer needed, the preconditions and postconditions are removed simply by recompiling the resource object classes without the aspect.

Design by contract with aspect-oriented programming

Growing community of inventors

San Francisco, CA, United States of America

Cristina Lopes