International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: Security Protocols with Isotropic Channels

Madhukar Anand
Eric Cronin
Micah Sherr
Matt Blaze
Sampath Kannan
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Abstract: We investigate the security properties of "isotropic channels", broadcast media in which a receiver cannot reliably determine whether a message originated from any particular sender and a sender cannot reliably direct a message away from any particular receiver. We show that perfect isotropism implies perfect (information-theoretic) secrecy, and that asymptotically close to perfect secrecy can be achieved on any channel that provides some (bounded) uncertainty as to sender identity. We give isotropic security protocols under both passive and active adversary models, and discuss the practicality of realizing isotropic channels over various media.
  title={Security Protocols with Isotropic Channels},
  booktitle={IACR Eprint archive},
  keywords={cryptographic protocols / unconditional security, secret-key agreement, provable security, isotropic channels},
  note={ 13459 received 7 Nov 2006},
  author={Madhukar Anand and Eric Cronin and Micah Sherr and Matt Blaze and Sampath Kannan},