Identity-based signcryption without trusted party
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As existing ID-based signature scheme needs to trust Private Key Generator(PKG) unconditionally,PKG can compute the private key of any user and forge a signature of any one in scheme.So an ID-based signature scheme without trusted PKG is proposed.In the scheme,the private key is generated by PKG and users,which can stop PKG forging signature.The scheme also has the merits of verifiability,unforgeability and undeniability,and only the designated receiver can verify the validity of the signature.