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A data aggregation scheme based on identity is proposed which utilizes the public-key cryptography to realize the negotiation of session keys. The solution uses small- sized seed matrix to generate a mass of public/private key pairs thus consumes little storage space. It realizes the identity authentication independent of the third party and has no use for infrastructure to sustain the key distribution centers. Security of the proposed solution is analyzed and some attacks that can be resisted are listed in this thesis.