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The existing provably secure threshold decryption schemes based on the Lagrange interpolation can only be applied to the (t, n) threshold structure. The first provably secure identity-based threshold decryption scheme on access structure is proposed, in which the PKG gets the adversary structure from the access structure, and then according to the adversary structure, the PKG ingeniously distributes...
The existing provably secure threshold signature schemes based on the Lagrange interpolation can only be applied to the (t, n) threshold structure. Through introducing the concept of access structure into the provably secure threshold signature, the first provably secure identity-based threshold signature scheme on access structure is proposed. The formal security proof under the adaptive chosen message...
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