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hello everyone i am olivier sanders and this is my presentation of the paper improving revocation for group signature with redactable signature in this paper we will consider the notion of group signature which is probably one of the main privacy preserving primitive a group signature schemes allows users to join a group managed by a group manager by interacting with this entity at the end of the interaction the user receives a signing key which essentially consists in some certificate that attests that the user has indeed joined the group and the interest of group signature is that user once they have joined the group can sign on behalf of the group and in particular the point is that the signature are anonymous except for an appointed entity which can be the group manager or some other entity depending on the models the interest of group signature is that in particular it allows anonymous access to a service meaning that the verifier will be able to check that the user is a valid use