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Round-Efficient Perfectly Secure Message Transmission Scheme Against General Adversary
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Abstract: | 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.) |
BibTeX
@misc{eprint-2010-23351, title={Round-Efficient Perfectly Secure Message Transmission Scheme Against General Adversary}, booktitle={IACR Eprint archive}, keywords={}, url={http://eprint.iacr.org/2010/450}, note={ kurosawa@mx.ibaraki.ac.jp 14841 received 20 Aug 2010}, author={Kaoru Kurosawa}, year=2010 }