Group Signature Resistant Against Colluding Attack

Group signature is a digital signature extension that allows a group member to sign a document anonymously on behalf of the group. Using public parameters of the group, any client can validate the documents legitimacy. The group signature does not expose the identity of the group member. In the event of a legal dispute, an authorized group member can use the signed document to reveal the identity of the group member. Group signatures have a wide range of uses in the corporate world, banks, and e-commerce. In this project, we created a group signature protocol using the Python programming language. The proposed technique has been shown to be robust to colluding attacks. Furthermore, even if some members quit the group the group signature remains valid. The proposed system confirms the full traceability feature. The method has a wide range of real-world applications, including e-banking, e-voting, and e-commerce.