Scratch-Off Cryptography 

Physical metaphores are oftne used to describe cryptographic primitives. For instance, encryption is often described via sealed envelopes and
bit commitment via locked boxes. In this sequence of papers we examine the power of various physical realiztion of such primitives.

 Papers:

• Tal Moran and Moni Naor,  Basing Cryptographic Protocols on Tamper-Evident Seals, ICALP 2005, Lecture Notes in Computer Science 3580, Springer,  pp. 285-297,  Abstract , Postscript , gzipped Postscript, PDF

• Tal Moran  and Moni Naor,   Polling with Physical Envelopes: A Rigorous Analysis of a Human-Centric Protocol
  Eurocrypt 2006,  Abstract, Postscript, gzipped Postscript,  PDF

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