针对现有车载自组织网络(Vehicular Ad-hoc Network,VANET)匿名认证方案在网络规模较大时存在复杂性和执行效率方面的问题,提出了一种基于盲签名和组合公钥(Combined Public Key,CPK)算法的认证方案,并对该方案所包含的认证协议进行了...针对现有车载自组织网络(Vehicular Ad-hoc Network,VANET)匿名认证方案在网络规模较大时存在复杂性和执行效率方面的问题,提出了一种基于盲签名和组合公钥(Combined Public Key,CPK)算法的认证方案,并对该方案所包含的认证协议进行了详细描述。安全性和执行效率分析表明,与现有方案相比提出的匿名认证方案在保证用户匿名性的同时还具有较高的执行效率。展开更多
组合公钥CPK(Combined Public Key)是我国拥有完全知识产权的认证技术,与PKI和IBC相比有其独特的优势。但由于密钥由种子密钥经过组合运算生成,因此可能发生碰撞,有效解决碰撞问题已成为CPK体制发展和完善的关键。介绍了CPK的发展、研...组合公钥CPK(Combined Public Key)是我国拥有完全知识产权的认证技术,与PKI和IBC相比有其独特的优势。但由于密钥由种子密钥经过组合运算生成,因此可能发生碰撞,有效解决碰撞问题已成为CPK体制发展和完善的关键。介绍了CPK的发展、研究现状和存在问题;根据其构建特点,提出了两种新的种子公/私钥组合选取方法,使得在相同规模的安全需求下,所需种子公/私钥量大大减少;针对产生碰撞的两种可能因素提出了解决方案:用分组密码对用户标识进行映射、按照特定规则产生种子公/私钥库以及对椭圆曲线参数进行约束,从根本上消除了碰撞。优化后的CPK体制,无碰撞,种子库规模小,构建效率高,占用空间少,安全性高,可靠性强,便于管理。展开更多
Combined public key （CPK） cryptography does not need certificates to guarantee the authenticity of public keys and avoids the inherent key escrow problem of identity-based cryptography. Based on the efficient CPK sc...Combined public key （CPK） cryptography does not need certificates to guarantee the authenticity of public keys and avoids the inherent key escrow problem of identity-based cryptography. Based on the efficient CPK scheme, we present an efficient three-round two-party authenticated key exchange protocol with strong security, which is provably secure in the standard model under the decisional Diffie-Hellman （DDH） assumption. The protocol can keep the session key secret from the adversary except that one party＇s ephemeral private key and static private key are all revealed to the adversary. Compared to the existing protocols, this protocol not only assures strong security but also is more efficient.展开更多
文摘针对现有车载自组织网络(Vehicular Ad-hoc Network,VANET)匿名认证方案在网络规模较大时存在复杂性和执行效率方面的问题,提出了一种基于盲签名和组合公钥(Combined Public Key,CPK)算法的认证方案,并对该方案所包含的认证协议进行了详细描述。安全性和执行效率分析表明,与现有方案相比提出的匿名认证方案在保证用户匿名性的同时还具有较高的执行效率。
文摘组合公钥CPK(Combined Public Key)是我国拥有完全知识产权的认证技术,与PKI和IBC相比有其独特的优势。但由于密钥由种子密钥经过组合运算生成,因此可能发生碰撞,有效解决碰撞问题已成为CPK体制发展和完善的关键。介绍了CPK的发展、研究现状和存在问题;根据其构建特点,提出了两种新的种子公/私钥组合选取方法,使得在相同规模的安全需求下,所需种子公/私钥量大大减少;针对产生碰撞的两种可能因素提出了解决方案:用分组密码对用户标识进行映射、按照特定规则产生种子公/私钥库以及对椭圆曲线参数进行约束,从根本上消除了碰撞。优化后的CPK体制,无碰撞,种子库规模小,构建效率高,占用空间少,安全性高,可靠性强,便于管理。
基金Supported by the Key Laboratory Foundation of Communication Technology of China (9140C1103040902)
文摘Combined public key （CPK） cryptography does not need certificates to guarantee the authenticity of public keys and avoids the inherent key escrow problem of identity-based cryptography. Based on the efficient CPK scheme, we present an efficient three-round two-party authenticated key exchange protocol with strong security, which is provably secure in the standard model under the decisional Diffie-Hellman （DDH） assumption. The protocol can keep the session key secret from the adversary except that one party＇s ephemeral private key and static private key are all revealed to the adversary. Compared to the existing protocols, this protocol not only assures strong security but also is more efficient.
