I have been doing some research in group and ring signature literature. I am trying to find a ring/group signature which provide the following propriety:
- Anonymity for the signer
- Verifiable by a group manager
- Signer in the group should be able to create the signature on their own
- The construction should be based on elliptic curve
I have checked the AOS ring signature, which are almost what I need but unfortunately I didn't find a way to add a group manager or something like that. Are AOS signature modifiable with a group manager ? Otherwise is there a scheme/research which has those proprieties?