  The main aim of this paper is to construct a multi-secret sharing scheme for
general access structure in a trusted dealer model using suitable hash function
and Lagrange's interpolation method. Even though, the proposed scheme is a
multi-secret and multi-use one, each participant has to carry only one share.
The suitable use of collision resistant one way hash function makes the scheme
efficient and multi-use. Moreover, the scheme has a nice property that secrets,
participants or qualified sets of participants may be added to or even may be
made inactive dynamically by the dealer to get a new access structure without
altering the shares of the existing participants in the old access structure.
Finally, in the proposed scheme, both the combiner and the share holders can
verify the correctness of the information that they are receiving from each
other.
