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Implications of Position in Cryptography

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Deniable RSA Signature: The Raise and Fall of Ali Baba

Serge Vaudenay

The 40 thieves realize that the fortune in their cave is vanishing. A rumor says that Ali Baba has been granted access (in the form of a certificate) to the cave but they need evidence to get justice from the Caliph. On the other hand, Ali Baba wants to be ...

Springer2012

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Giovanni De Micheli, Sandro Carrara, Irene Taurino, Cristina Boero, Camilla Baj-Rossi

Biosensors are heterogenous devices, incorporating biological struc- tures combined with electronics, optical or other readout systems. They have been developed for detecting different biomolecules and/or pathogens and represent a key technology for advanc ...

Ieee2012

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Christine Neuberg

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EPFL2011

Model Checking Security Protocols: A Multiagent System Approach

Security protocols specify the communication required to achieve security objectives, e.g., data-privacy. Such protocols are used in electronic media: e-commerce, e-banking, e-voting, etc. Formal verification is used to discover protocol-design flaws. In t ...

Imperial College London2011

Distance Bounding with IEEE 802.15.4a: Attacks and Countermeasures

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Impulse Radio Ultra-Wideband, in particular the recent standard IEEE 802.15.4a, is a primary candidate for implementing distance bounding protocols, thanks to its ability to perform accurate indoor ranging. Distance bounding protocols allow two wireless de ...

Institute of Electrical and Electronics Engineers2011

Cryptographic Hash Functions in Groups and Provable Properties

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We consider several "provably secure" hash functions that compute simple sums in a well chosen group (G,*). Security properties of such functions provably translate in a natural way to computational problems in G that are simple to define and possibly also ...

EPFL2011

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EPFL2011

A Note on a Privacy-Preserving Distance-Bounding Protocol

Aikaterini Mitrokotsa, Jean-Philippe Aumasson

Distance bounding protocols enable a device to establish an upper bound on the physical distance to a communication partner so as to prevent location spoofing, as exploited by relay attacks. Recently, Rasmussen and Cˇapkun (ACM-CCS’08) observed that these ...

Springer2011

Using the Cloud to Determine Key Strengths

Arjen Lenstra, Thorsten Kleinjung

We develop a new methodology to assess cryptographic key strength using cloud computing, by calculating the true economic cost of (symmetric- or private-) key retrieval for the most common cryptographic primitives. Although the present paper gives the curr ...

2011

Coordinating Logistics Operations with Privacy Guarantees

Boi Faltings, Thomas Léauté

Several logistics service providers serve a certain number of customers, geographically spread over an area of operations. They would like to coordinate their operations so as to minimize overall cost. At the same time, they would like to keep information ...

2011