Scheme to authorize a member without revealing it's identity. Member's identity is hidden is the key image.
Used libraries: EcPy
Curve: bn254, base points: (1, 2) and G_2
Run python3 verify_sign.py
Random generated ring members and user key.
generate_sign.py generates a dict to verify
verify_sign.py verifies a dict, generated by generate()
Size: n + 2 scalars, 1 EC point (user's key image), members' keys
Verify operations: 2n + 4 ec_mul, 3n + 3 ec_add