The literature contains a variety of different mixes, some of which have been used in deployed anonymity systems. We explore their anonymity and message delay properties, and show how to mount active attacks against them by altering the traffic between the mixes.

in this seductively simple formulation. Indeed, the book represents reductionism at its best, as the authors guide the reader through the many intermediate levels that link neurons with mental life. In so doing they attack a problem that has persisted for some decades in the neurosciences, since the development

This paper describes an active attackagainst the Transport Control Protocol (TCP) which allows a cracker to redirect the TCP stream through his machine thereby permitting him to bypass the protection o ered by suchasystem as a one-time password [SKEY] or ticketing authentication [Kerberos]. The TCP

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Introduction. In this paper I outline some of the most frequent attacks used against computer systems. Firstly we introduce the goals of computer security. Then we show how these can be affected by both external and internal threats. Goals of Computer Security

Abstract—Many secure MANET routing protocols have been proposed in the literature which employ non repudiable cryptographic authentication. However, they have not been explicitly designed to provide non repudiable proof of active attacks (NPAA). For example, Ariadne with digital signatures (ADS

. A protocol is described which allows to send and receive messages anonymously using an arbitrary communication network, and it is proved to be unconditionally secure. This improves a result by DAVID CHAUM: The DC-net guarantees the same, but on the assumption of a reliable broadcast network. Since unconditionally secure Byzantine Agreement cannot be achieved, such a reliable broadcast network cannot be realized by algorithmic means. The solution proposed here, the DC + -net, uses the DC-net, but replaces the reliable broadcast network by a fail-stop one. By choosing the keys necessary for the DC-net dependently on the previously broadcast messages, the fail-stop broadcast can be achieved unconditionally secure and without increasing the complexity of the DC-net significantly, using an arbitrary communication network. Categories and Subject Descriptors: C.2.0 [Computer-Communication Networks]: General --- Security and protection, E.3 [Data Encryption], F.2.1 [Analysis of Algorithms...

-measures”, that are meant to resist both passive and active attacks. This study started four years ago with TIMA (Grenoble), in the framework of the project MARS [31]. We highlight some research direc-tions towards dependable and cost-effective dual counter-measures.

Information flow controls can be used to protect both data confidentiality and data integrity. The certification of the security degree of a program that runs in untrusted environments still remains an open problem in language-based security. The notion of robustness asserts that an active attacker

direction. WLAN traffic travels over radio waves that cannot be constrained by the walls of a building. As a result of this, intruders and would-be hackers can potentially access the network from the parking lot or across the street. In this paper, we have discussed about Active attacks on WLANs