Computer science faculty must attract and retain students by offer-ing innovative courses that spark student interest, yet still teach core, computer science concepts. These efforts have become par-ticularly important as computer science enrollments have declined, thus increasing concerns for attracting and retaining students. We describe an innovative course that leverages students ’ interest in computer security issues to attract and retain technically-oriented students. Our initial vision was to offer a course covering computer viruses—a subject that even a novice computer user has some familiarity. To avoid the controversy associated with teaching stu-dents how to write malicious software, we focused the course on techniques for defending against viruses, so we named the course Defense Against the Dark Arts. In teaching the course, we have found the subject matter provides an engaging way to introduce and reinforce many important computer science concepts that other courses often cover, most particularly, the traditional com-piler course. We have taught the course three times at two separate institutions, with a third school soon to follow. The course has been well received by students—completely filling each semester with enrollments that are four to five times greater than the com-piler course. Furthermore, student surveys indicate that the course raises students ’ awareness of computer security while introducing students to important program translation and analysis concepts.

Mobile users share the same expectations as wired users: they want to communicate with other people, they ex-pect the communication to be secure, and it should all be easy. However, mobility poses many challenges for security. Communication is often ad hoc, and the infras-tructure may be untrusted

serious alternative. This work analyzes the implementation of both a client-server and a peer-to-peer networking model for the prototype shooter game Planet π4. Initially, a survey introduces recent academic approaches to peer-to-peer systems specifically designed for games. Of those, one system

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of messages. Unfortunately, in most real-world settings, public key infrastructures (PKI) are uncommon and distributing a secret in a public space is difficult. Thus, it is a challenge to exchange authentic public keys in a scalable, secure, and easy to use fashion. In this paper, we propose GAnGS, a protocol

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First, I would like to thank to Dimka Karastoyanova and Mariano Cilia for all the fruitful discussions, their guidance and support through the course of this project. Thanks also to Prof. Alejandro Buchmann who sponsored my stay at Technische Universität Darmstadt during the spring of 2004. The special thanks go to my advisor, Mariano Cilia, who has made all this possible. Finally, I’d like to thank to my family for all these years of support.

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