Key-insulated aggregate signature

In order to minimize the damage caused by key exposure in aggregate signatures, a key-insulated aggregate signature scheme is proposed in this paper. We give the definition and the security model of the key-insulated aggregate signature. We also construct a concrete key-insulated aggregate signature scheme that meets our definition. Our scheme has the properties of efficient verification and short signature length. We prove the security of our scheme in the random oracle model under the computation Diffie-Hellman assumption.

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