Lattice-Based Threshold Changeability for Standard Shamir Secret-Sharing Schemes

  title={Lattice-Based Threshold Changeability for Standard Shamir Secret-Sharing Schemes},
  author={Ron Steinfeld and Huaxiong Wang and Josef Pieprzyk},
  journal={IEEE Transactions on Information Theory},
We consider the problem of increasing the threshold parameter of a secret-sharing scheme after the setup (share distribution) phase, without further communication between the dealer and the shareholders. Previous solutions to this problem require one to start off with a nonstandard scheme designed specifically for this purpose, or to have communication between shareholders. In contrast, we show how to increase the threshold parameter of the standard Shamir secret-sharing scheme without… CONTINUE READING
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