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AN EFFICIENT CERTIFICATELESS MULTI-RECEIVER THRESHOLD DECRYPTION SCHEME

机译:有效的可认证多接收器阈值解密方案

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摘要

Threshold decryption allows only quorum cooperate users to decrypt ciphertext encrypted under a public key. However, such threshold decryption scheme cannot be applied well in this situation where all users have their public and private key pairs, but do not share any private keys corresponding to the public keys, such as mobile network featured with dynamic character. The direct way to achieve threshold decryption in this case is to divide the message into several pieces and then encrypt these pieces with the public keys of different users. However, this is very inefficient. Multireceiver threshold decryption scheme that could be applied efficiently in the above situation. Recently, some certificateless (ID-based) multireceiver threshold decryption (signcryption) schemes are introduced. But the bilinear pairings are used in most of the existing schemes. In this paper, we propose an efficient certificateless threshold decryption scheme using elliptic curve cryptography (ECC) without bilinear pairing. Performance analysis shows that the proposed scheme has lower computation cost than existing some threshold decryption schemes in both encryption and decryption process. Security analysis shows that our scheme is IND-CCA secure, and no one outside of selected receivers can disclose receivers identities, against the adversaries defined in CL-PKC system under the random oracle model.
机译:阈值解密仅允许仲裁合作用户解密在公共密钥下加密的密文。但是,这种阈值解密方案不能很好地应用于所有用户都有其公钥和私钥对,但是不共享任何与公钥相对应的私钥的情况,例如具有动态特征的移动网络。在这种情况下,实现阈值解密的直接方法是将消息分成几部分,然后使用不同用户的公钥对这些部分进行加密。但是,这是非常低效的。在上述情况下可以有效应用的多接收器阈值解密方案。最近,引入了一些无证书(基于ID)的多接收器阈值解密(signcryption)方案。但是在大多数现有方案中都使用了双线性对。在本文中,我们提出了一种使用椭圆曲线密码学(ECC)而不使用双线性配对的有效的无证书阈值解密方案。性能分析表明,与现有的一些阈值解密方案相比,该方案在加密和解密过程中具有较低的计算成本。安全分析表明,我们的方案是IND-CCA安全的,并且在随机预言机模型下,针对CL-PKC系统中定义的对手,选定接收方之外的任何人都无法透露接收方身份。

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