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Secure communication using authenticated channels

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Secure and Privacy-Preserving Communication in Hybrid Ad Hoc Networks

Jean-Pierre Hubaux, Srdan Capkun

We present a scheme for secure and privacy-preserving communication in hybrid ad hoc networks. Our scheme enables users to secure communication and to protect their anonymity and location privacy. Our approach is based on frequently changing node pseudonym ...

2004

Reactive security for multimedia systems

Antonio Romeo

Books, videos, music, still images and any other type of media information, share a number of features that enable their migration from traditional delivery technologies to an all-electronic delivery model. They can easily be digitized, stored, compressed ...

EPFL2004

Digital Signature Schemes with Domain Parameters

Serge Vaudenay

Digital signature schemes often use domain parameters such as prime numbers or elliptic curves. They can be subject to security threats when they are not treated like public keys. In this paper we formalize the notion of "signature scheme with domain param ...

2004

Quantum Cryptography : On the Security of the BB84 Key-Exchange Protocol

Thomas Baignères

In 1984, C.H. Bennet and G. Brassard proposed a new protocol aimed to solve the problem of symmetric cryptographic key exchange. This protocol was called BB84 after the name of its authors. While a traditional method would rely on public key cryptography ( ...

2003

Mobility Helps Peer-to-Peer Security

Jean-Pierre Hubaux, Levente Buttyan, Srdan Capkun

We propose a straightforward technique to provide peer-to-peer security in mobile networks. We show that far from being a hurdle, mobility can be exploited to set up security associations among users. We leverage on the temporary vicinity of users, during ...

2003

Password interception in a SSL/TLS channel

Serge Vaudenay, Martin Vuagnoux

Simple password authentication is often used e.g. from an e-mail software application to a remote IMAP server. This is frequently done in a protected peer-to-peer tunnel, e.g. by SSL/TLS. At Eurocrypt'02, Vaudenay (2002) presented vulnerabilities in paddin ...

2003

SECTOR: Secure Tracking of Node Encounters in Multi-hop Wireless Networks

Jean-Pierre Hubaux, Levente Buttyan, Srdan Capkun

In this paper we present SECTOR, a set of mechanisms for the secure verification of the time of encounters between nodes in multi-hop wireless networks. This information can be used notably to prevent wormhole attacks (without requiring any clock synchroni ...

2003

Cryptography with Guardian Angels: Bringing civilization to pirates - Abstract

Serge Vaudenay, Gildas Avoine

In contrast with traditional cryptographic protocols in which parties can have access to common third parties, and where at least one of them is assumed to be honest, we propose here a new model which is relevant for networks of communication devices with ...

2003

High performance VLSI architectures implementing strong cryptographic primitives

Feth Allah Cherigui

The main topic of this thesis is related to the state of the art in designing cryptographic primitives from a hardware point of view. A special emphasis is dedicated to low-power/low-energy CMOS design. A set of solutions is proposed including an LFSR base ...

EPFL2002

Building blocks for secure services

Levente Buttyan

This thesis is concerned with two security mechanisms: authenticated key transport and rational exchange protocols. These mechanisms are potential building blocks in the security architecture of a range of different services. Authenticated key transport pr ...

EPFL2002