Marius Cristea

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—The effectiveness of synthetic coordinate systems against DoS and spam stems from the fact that, while changing or hiding a logical address is easier, changing the location of the spammer inside the network should be harder. But synthetic coordinate systems are limited by the fact that malicious nodes can easily lie about their position or introduce(More)
—We discuss some security weaknesses of Scalance wireless access points and clients. These devices, developed by Siemens, are commonly used for wireless communication in network control systems. After the identification of the Stuxnet worm, which targeted PLCs from uranium enrichment facilities in Iran, these devices become of increased interest to the(More)
—In order to increase the resilience against spam, we design and implement a protocol based on cryptographic puzzles for an open-source web based e-mail client. Our proposal is compatible with existing e-mail infrastructure and does not require modifications on the server side. The only add-on is a stand-alone ticketing server that is used to deliver the(More)
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