Verifiably encrypted multi-signature scheme in the standard model

In 2011, combining verifiably encrypted signature schemes and multi-signature schemes, Dou et al. proposed a new type of signatures which they called verifiably encrypted multi-signature schemes. Dou et al.'s scheme is proved secure under the random oracles. In this paper, we proposed a verifiably encrypted multi-signature scheme under the standard models. A verifiably encrypted multi-signature scheme allows a group of signers to produce a compact, joint signature of a common document and to encrypt the signature under the public key of a trusted third party, called adjudicator; the verifier can be confirmed that the group has signed the common document by verifying the encrypted signature without deducing any information of the signature. These verifiably encrypted multi-signature schemes could be useful for contract signing and distribution of a certificate authority. © 2013 ISSN 1881-803X.