Paper 2010/450

Round-Efficient Perfectly Secure Message Transmission Scheme Against General Adversary

Kaoru Kurosawa


In the model of Perfectly Secure Message Transmission Schemes (PSMTs), there are $n$ channels between a sender and a receiver, and they share no key. An infinitely powerful adversary $A$ can corrupt (observe and forge) the messages sent through some subset of $n$ channels. For non-threshold adversaries called $Q^2$, Kumar et al. showed a many round PSMT \cite{KGSR}. In this paper, we show round efficient PSMTs against $Q^2$-adevrsaries. We first give a $3$-round PSMT which runs in polynomial time in the size of the underlying linear secret sharing scheme. We next present a $2$-round PSMT which is inefficient in general. (However, it is efficient for some special case.)

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Publication info
Published elsewhere. Unknown where it was published
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kurosawa @ mx ibaraki ac jp
2010-08-24: received
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      author = {Kaoru Kurosawa},
      title = {Round-Efficient Perfectly Secure Message Transmission Scheme Against General Adversary},
      howpublished = {Cryptology ePrint Archive, Paper 2010/450},
      year = {2010},
      note = {\url{}},
      url = {}
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