Changing Thresholds in the Absence of Secure Channels.
Keith M. Martin, Josef Pieprzyk, Reihaneh Safavi–Naini, Huaxiong Wang · 1999
The ways the threshold parameter can be modi¯ed after the setup of a secret sharing scheme is the main theme of this work. The con-siderations are limited to the case when there are no secure channels. First we motivate the problem and discuss methods of threshold change when the dealer is still active and can use broadcasting to implement