This paper proposes a signature scheme where the signatures are generated by the cooperation of a number of people from a given group of senders and the signatures are verified by a certain number of people from the group of recipients. Shamir's threshold scheme and Schnorr's signature scheme are used to realize the proposed scheme.
@article{arxiv.cs/0409014,
title = {A Digital Signature with Threshold Generation and Verification},
author = {Sunder lal and Manoj Kumar},
journal= {arXiv preprint arXiv:cs/0409014},
year = {2007}
}