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Distance-Bounding Protocols

Extended abstract
  • Stefan Brands
  • David Chaum
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 765)

Abstract

It is often the case in applications of cryptographic protocols that one party would like to determine a practical upper-bound on the physical distance to the other party. For instance, when a person conducts a cryptographic identification protocol at an entrance to a building, the access control computer in the building would like to be ensured that the person giving the responses is no more than a few meters away.

The “distance bounding” technique we introduce solves this problem by timing the delay between sending out a challenge bit and receiving back the corresponding response bit. It can be integrated into common identification protocols. The technique can also be applied in the three-party setting of “wallets with observers” in such a way that the intermediary party can prevent the other two from exchanging information, or even developing common coinflips.

Keywords

Signature Scheme Commitment Scheme Probabilistic Encryption Subliminal Channel Mafia Fraud 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1994

Authors and Affiliations

  • Stefan Brands
    • 1
  • David Chaum
    • 2
  1. 1.CWIAmsterdam
  2. 2.CWI & DigiCashAmsterdam

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