Security Properties: Two Agents Are Sufficient

  title={Security Properties: Two Agents Are Sufficient},
  author={Hubert Comon-Lundh and V{\'e}ronique Cortier},
We consider an important family of cryptographic protocols and a class of security properties which encompasses secrecy and authentication. We show that it is always sufficient to consider a bounded number of agents b (b = 2 for secrecy properties for example): if there is an attack involving n agents, then there is an attack involving at most b agents. 
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