Robust ID-based threshold signcryption scheme from pairings

Based on the good properties of bilinear pairings on elliptic curves, many good ID-based cryptographic schemes have been proposed. However, in these proposed schemes, the private key generator (PKG) should be assumed to be trusted, while in real environment, this assumption does not always hold. To overcome this weakness, the threshold technology was used to devise a secure ID-based signcryption scheme. Because the threshold technology is adopted not only in the master key management but also in the group signature, the scheme can achieve high security and resist some malicious attacks under a certain threshold.