In key escrow field it is important to solve the problem thatuser's secret key completely depends on the trusted escrow agency. In 1995, some methods of solving the problem were presented. But these methods are no...In key escrow field it is important to solve the problem thatuser's secret key completely depends on the trusted escrow agency. In 1995, some methods of solving the problem were presented. But these methods are no better than that of directly using threshold cryptography. In this paper, we present a common pattern of threshold key escrow scheme based on public key cryptosystem, and a detailed design based on the improved RSA algorithm is given. The above problem is solved by this scheme.展开更多
A ccmspiracy attack is proposed to show that Wang-Li's scheme is instcure,because any t or more group members can impersonate other t member to sign any message withoutholding the responsibility. To avoid the cons...A ccmspiracy attack is proposed to show that Wang-Li's scheme is instcure,because any t or more group members can impersonate other t member to sign any message withoutholding the responsibility. To avoid the conspiracy attack, this paper prestentsa new (t,n)threshold signature scheme with traceablt signers. A (t. n) threshold signature scheme allows t ormore group members of the group lo generate a signature on behalf of the group, Any less than tmembers cannot generate a valid signature, andany set of the group cannot impersonate another set ofmembers to sign any message without holding the responsibility. In case of disputes., the thresholdsignature can be opened, so that the original signers ean be traced without repealing the secretkeys.展开更多
分析了两种有效的可验证秘密共享方案:Feldman s VSS方案和Pedersen s VSS方案。但是它们都是门限方案,当推广到一般接入结构时,效率都很低。为此,提出了一个一般接入结构上的可验证秘密共享方案。参与者的共享由秘密分发者随机生成,采...分析了两种有效的可验证秘密共享方案:Feldman s VSS方案和Pedersen s VSS方案。但是它们都是门限方案,当推广到一般接入结构时,效率都很低。为此,提出了一个一般接入结构上的可验证秘密共享方案。参与者的共享由秘密分发者随机生成,采用秘密信道发送。每个授权子集拥有一个的公开信息,通过公开的信息,参与者能够验证属于自己份额的共享的有效性。该方案具有两种形式:一种是计算安全的,另一种是无条件安全的。其安全性分别等同于Feldman sVSS方案和Pedersen sVSS方案,但在相同的安全级别下,新方案更有效。展开更多
针对比特币的PoW(proof of work)共识机制中资源消耗巨大、系统性能存在瓶颈和“公地悲剧”问题,从博弈论的角度分析了比特币系统后期只有交易费奖励所带来的“公地悲剧”现象,提出了基于门限密码方案的共识机制(a consensus mechanism ...针对比特币的PoW(proof of work)共识机制中资源消耗巨大、系统性能存在瓶颈和“公地悲剧”问题,从博弈论的角度分析了比特币系统后期只有交易费奖励所带来的“公地悲剧”现象,提出了基于门限密码方案的共识机制(a consensus mechanism based on threshold cryptography,TCCM).首先,新共识协议引入了节点保证金的思想,提出了一种基于门限群签名理论的保证金模型.该模型既能够确保保证金的安全,又为节点诚实地记账提供保障.其次,利用门限加密的思想构造了记账权竞价模型来产生区块链记账节点,这能够保证记账权竞价环境的公平性和记账节点产生的随机性.同时,在原有的区块奖励基础上,设计了新的激励机制,使得更多的节点能够参与共识的全过程.最后,安全性和性能分析结果表明,该共识机制既有效地降低了资源消耗,又提高了交易处理效率,使得整个区块链系统变得更加安全可靠.展开更多
基金This work was supported by the National Natural Science Foundation of China (Grant Nos. 69772037, 60072018).
文摘In key escrow field it is important to solve the problem thatuser's secret key completely depends on the trusted escrow agency. In 1995, some methods of solving the problem were presented. But these methods are no better than that of directly using threshold cryptography. In this paper, we present a common pattern of threshold key escrow scheme based on public key cryptosystem, and a detailed design based on the improved RSA algorithm is given. The above problem is solved by this scheme.
文摘A ccmspiracy attack is proposed to show that Wang-Li's scheme is instcure,because any t or more group members can impersonate other t member to sign any message withoutholding the responsibility. To avoid the conspiracy attack, this paper prestentsa new (t,n)threshold signature scheme with traceablt signers. A (t. n) threshold signature scheme allows t ormore group members of the group lo generate a signature on behalf of the group, Any less than tmembers cannot generate a valid signature, andany set of the group cannot impersonate another set ofmembers to sign any message without holding the responsibility. In case of disputes., the thresholdsignature can be opened, so that the original signers ean be traced without repealing the secretkeys.
文摘分析了两种有效的可验证秘密共享方案:Feldman s VSS方案和Pedersen s VSS方案。但是它们都是门限方案,当推广到一般接入结构时,效率都很低。为此,提出了一个一般接入结构上的可验证秘密共享方案。参与者的共享由秘密分发者随机生成,采用秘密信道发送。每个授权子集拥有一个的公开信息,通过公开的信息,参与者能够验证属于自己份额的共享的有效性。该方案具有两种形式:一种是计算安全的,另一种是无条件安全的。其安全性分别等同于Feldman sVSS方案和Pedersen sVSS方案,但在相同的安全级别下,新方案更有效。
文摘针对比特币的PoW(proof of work)共识机制中资源消耗巨大、系统性能存在瓶颈和“公地悲剧”问题,从博弈论的角度分析了比特币系统后期只有交易费奖励所带来的“公地悲剧”现象,提出了基于门限密码方案的共识机制(a consensus mechanism based on threshold cryptography,TCCM).首先,新共识协议引入了节点保证金的思想,提出了一种基于门限群签名理论的保证金模型.该模型既能够确保保证金的安全,又为节点诚实地记账提供保障.其次,利用门限加密的思想构造了记账权竞价模型来产生区块链记账节点,这能够保证记账权竞价环境的公平性和记账节点产生的随机性.同时,在原有的区块奖励基础上,设计了新的激励机制,使得更多的节点能够参与共识的全过程.最后,安全性和性能分析结果表明,该共识机制既有效地降低了资源消耗,又提高了交易处理效率,使得整个区块链系统变得更加安全可靠.
