Short Abstract
A multi-signature is a digital signature scheme which allows a group of users to sign a common message. The rogue key attack is the most annoying attack on such signatures.
The recent engagement of multi-signatures in blockchain applications is quite appealing. In some particular blockchains, the forward secure multi-signatures are also useful. We study the current state-of-the-art and identify some design goals for secure multi-signatures in plain-public key model.