On the security of verifiably encrypted signature schemes in a multi-user setting

摘要

A verifiably encrypted signature provides a way to encrypt a signature under a third party's public key and proves that the resulting ciphertext contains such a signature. In this paper, we analyze the security of three verifiably encrypted signature schemes in a multi-user setting in which an adversary is allowed to access adjudication oracles for different users, but the same adjudicator.