We study two classes of attacks that can be mounted by manipulation of routing information and exhaustive power consumption. Our attacks allow an attacker to partition a network, reduce its goodput, hi-jack and filter traffic from and to victim nodes, and thereby eavesdrop and perform traffic analysis. The methods described are "stealth attacks" in that they minimize the cost to and visibility of the attacker. We introduce the notion of reputation based control, and suggest that it can be used to augment existing routing protocols in order to immunize these against stealth attacks.

GiveALink.org is a social bookmarking site where users may donate and view their personal bookmark files online securely. The bookmarks are analyzed to build a new generation of intelligent information retrieval techniques to recommend, search, and personalize the Web. GiveALink does not use tags, content, or links in the submitted Web pages. Instead we present a semantic similarity measure for URLs that takes advantage both of the hierarchical structure in the bookmark files of individual users, and of collaborative filtering across users. In addition, we build a recommendation and search engine from ranking algorithms based on popularity and novelty measures extracted from the similarity-induced network. Search results can be personalized using the bookmarks submitted by a user. We evaluate a subset of the proposed ranking measures by conducting a study with human subjects.

Abstract — In this position paper we discuss various issues related to so-called stealth attacks. We elaborate on stealth attacks in the context of three common types of wireless networks, namely ad hoc networks, hybrid networks, and sensor networks. We consider the relevance of these settings to various vehicular environments; e.g., emergency and rescue operations, military operations, and theft recovery. Along with this, we discuss adversarial models. We furthermore explore the level of threat in a set of example situations and discuss potential tools that could be used to reduce the severity of stealth attacks in these contexts. I. INTRODUCTION AND RELATED WORK An ad-hoc network is a network formed “on the fly ” by a set of participants who typically have not all previously interacted with each other, and may not even have been

Abstract — In this position paper we discuss various issues related to so-called stealth attacks. We elaborate on stealth attacks in the context of three common types of wireless networks, namely ad hoc networks, hybrid networks, and sensor networks. We consider the relevance of these settings to various vehicular environments; e.g., emergency and rescue operations, military operations, and theft recovery. Along with this, we discuss adversarial models. We furthermore explore the level of threat in a set of example situations and discuss potential tools that could be used to reduce the severity of stealth attacks in these contexts. I. INTRODUCTION AND RELATED WORK An ad-hoc network is a network formed “on the fly ” by a set of participants who typically have not all previously interacted with each other, and may not even have been aware of each