A NOVEL WAY OF VERIFIABLE REDISTRIBUTION OF THE SECRET IN A MULTIUSER ENVIRONMENT USING GROUP KEY

P Devaki, G Raghavendra Rao

Abstract: Shamir’s threshold secret sharing is one of the mechanisms to distribute the shares of a secret to a group of authorized users called access structure (m, n). But the group members may change based on the organizations needs. This change of access structure requires the redistribution of the shares of that secret to the new members of that group (m’, n’). In this paper we are proposing a method to distribute without using a private channel. Also redistribute the shares of a secret on change in the access structure. The redistribution does not involve the members of the old access structure. It is also proposed to verify the shares and also the reconstructed secret by each and every member of the group.

Keywords: Redistribution, Threshold secret sharing, Old share holders, Verification.

DOI: https://doi.org/10.15623/ijret.2014.0309028