  In this paper, we propose a Directed Threshold Multi-Signature Scheme. In
this threshold signature scheme, any malicious set of signers cannot
impersonate any other set of signers to forge the signatures. In case of
forgery, it is possible to trace the signing set. This threshold signature
scheme is applicable when the message is sensitive to the signature receiver;
and the signatures are generated by the cooperation of a number of people from
a given group of senders.
