Abstract:

Existent heterogeneous cryptosystems don’t have the ability of encrypting any lengths of messages,as well as no ability to sign a signature without knowing the content of the message.Therefore,this paper proposes a hybrid blind signcryption scheme from Identity-based Cryptosystem(IBC) to Certificateless Cryptosystem(CLC).Private Key Generation (PKG) in IBC and Key Generation Center(KGC) in CLC can generate their own system master keys and have the ability to encrypt any long message and blind signcryption.Analysis results show that compared with existent signcryption schemes,the scheme has high speed and efficiency,and small computation,which is more feasible under the random oracle model.

Key words: heterogeneous cryptosystem, hybrid signcryption, Identity-based Cryptosystem(IBC), Certificateless Cryptosystem(CLC), blind signcryption

摘要：

现有的异构密码体制不具备可加密任意长度消息的能力,无法在签名者不知道消息内容的情况下进行签名。为此,提出一种由基于身份的密码(IBC)体制到无证书密码(CLC)体制的混合盲签密方案。私钥生成器(PKG)和密钥生成中心(KGC)能够分别在IBC体制和CLC体制中产生 各自的系统主密钥,而且具有可加密任意长消息和盲签密的能力。分析结果表明,与现有的签密方案相比,该方案具有速度快、效率高、计算量小等特点,在随机预言模型下具有更高的可行性。

关键词: 异构密码系统, 混合签密, 基于身份的密码体制, 无证书密码体制, 盲签密

CLC Number: 

• TP391