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1.Please define the basic security features of a group signature scheme, i.e., unforgeability, anonymity and traceability. 2.Please define anonymity (unlinkability) for mutual authentication formally. 3.Please

1.Please define the basic security features of a group signature scheme, i.e., unforgeability, anonymity and traceability.

2.Please define anonymity (unlinkability) for mutual authentication formally.

3.Please define semantic security for attribute-based encryption formally

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