A construction for multisecret threshold schemes
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A multisecret threshold scheme is a system that protects a number of secrets (or keys) among a group of participants, as follows. Given a set of n participants, there is a secret sk associated with each k-subset K of these participants. The scheme ensures that sK can be reconstructed by any group of t participants in K (1 <- t <- k). A lower bound has been established on the amount of information that participants must hold in order to ensure that any set of up to w participants K(1≤t≤k) cannot obtain any information about a secret with which they are not associated. In this paper, for parameters t=2 and w=n−k+t−1, we give a construction for multisecret threshold schemes that satisfy this bound.