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本文根据L.Harn提出的修正ElGamal签名方案和Rabin公钥加密体制,提出了数字移动通信网中一种高效的认证与密钥分配方案。与[6]的方案相比,新方案具有以下改进:(1)由于采用了修正ElGamal签名方案,用户在预备阶段的计算量有所降低。(2)在实时呼叫建立阶段,网络的计算负荷有所减少。(3)方案中没有采用单钥体制,因此降低了方案实现时的成本。分析结果表明,该方案不仅具有较低的计算复杂度,而且具有很高的安全性。
In this paper, according to L. Harn’s modified ElGamal signature scheme and Rabin public key cryptosystem, an efficient authentication and key distribution scheme in digital mobile communication network is proposed. Compared with the scheme of [6], the new scheme has the following improvements: (1) Due to the adoption of the modified ElGamal signature scheme, the user’s computation in the preliminary stage is reduced. (2) In the real-time call setup phase, the network’s computing load is reduced. (3) Single-key system is not adopted in the scheme, thus reducing the cost when the scheme is implemented. The analysis results show that this scheme not only has lower computational complexity, but also has high security.