As an improtant cryptographic scheme, signcryption scheme has been widely used in applications since it could provide both of signature and encryption. With the development of the certificateless public key cryptograp...As an improtant cryptographic scheme, signcryption scheme has been widely used in applications since it could provide both of signature and encryption. With the development of the certificateless public key cryptography （CLPKC）, many certificatelss signcryption （CLSC） schemes using bilinear pairing hve been proposed. Comparated other operations, the bilinear pairing operaion is much more compulicated. Therefore, CLSC scheme without bilinear pairing is more suitable for applications. Recently, Jing et al. proposed a CLSC scheme without bilinear pairing and claimed their scheme is secure against two types of adversaries. In this paper, we will show their scheme provide neither unforgeability property nor confidentiality property. To improve security, we also propose a new CLSC scheme without pairing and demonstrate it is provably secure in the random oracle model.展开更多
实时地图在无人驾驶车辆导航中发挥着至关重要的作用.和现有的地图更新方法相比,基于群智感知的实时地图更新方法成本更低且准确性更高.然而,此方法在地图更新过程中,会增加数据及用户身份泄露的风险.如何保证上传数据的机密性和用户的...实时地图在无人驾驶车辆导航中发挥着至关重要的作用.和现有的地图更新方法相比,基于群智感知的实时地图更新方法成本更低且准确性更高.然而,此方法在地图更新过程中,会增加数据及用户身份泄露的风险.如何保证上传数据的机密性和用户的匿名性是实时地图更新中的一个挑战.提出了一种安全高效的无人驾驶车辆地图更新方案(secure and efficient map update scheme for AVs,SEMU).在SEMU方案中,利用签密和代理重加密技术,车辆用户对感知数据进行签密,将加密的数据存储在车辆雾节点中,当地图公司希望访问数据时,雾节点将加密的数据发送给云服务平台,云服务平台重新加密数据发送给地图公司,同时,云服务平台无法获得任何有关数据的明文信息.利用聚合签名技术,降低了计算开销.通过对车辆用户的信誉管理,提高了数据的可靠性.最后,安全性分析表明该方案实现了数据的机密性、完整性、可靠性、身份可验证性和不可否认性,保证了用户的匿名性和可追踪性.仿真验证了方案的激励性,并从计算开销方面证明了它的有效性.展开更多
基金This research was supported by the National Natural Science Foundation of China （Grant No. 61202447）, Natural Science Foundation of Hebei Province of China （F2013501066）, Northeastern University at Qinhuangdao Science and Technology Support Program （xnk201307）.
文摘As an improtant cryptographic scheme, signcryption scheme has been widely used in applications since it could provide both of signature and encryption. With the development of the certificateless public key cryptography （CLPKC）, many certificatelss signcryption （CLSC） schemes using bilinear pairing hve been proposed. Comparated other operations, the bilinear pairing operaion is much more compulicated. Therefore, CLSC scheme without bilinear pairing is more suitable for applications. Recently, Jing et al. proposed a CLSC scheme without bilinear pairing and claimed their scheme is secure against two types of adversaries. In this paper, we will show their scheme provide neither unforgeability property nor confidentiality property. To improve security, we also propose a new CLSC scheme without pairing and demonstrate it is provably secure in the random oracle model.
文摘实时地图在无人驾驶车辆导航中发挥着至关重要的作用.和现有的地图更新方法相比,基于群智感知的实时地图更新方法成本更低且准确性更高.然而,此方法在地图更新过程中,会增加数据及用户身份泄露的风险.如何保证上传数据的机密性和用户的匿名性是实时地图更新中的一个挑战.提出了一种安全高效的无人驾驶车辆地图更新方案(secure and efficient map update scheme for AVs,SEMU).在SEMU方案中,利用签密和代理重加密技术,车辆用户对感知数据进行签密,将加密的数据存储在车辆雾节点中,当地图公司希望访问数据时,雾节点将加密的数据发送给云服务平台,云服务平台重新加密数据发送给地图公司,同时,云服务平台无法获得任何有关数据的明文信息.利用聚合签名技术,降低了计算开销.通过对车辆用户的信誉管理,提高了数据的可靠性.最后,安全性分析表明该方案实现了数据的机密性、完整性、可靠性、身份可验证性和不可否认性,保证了用户的匿名性和可追踪性.仿真验证了方案的激励性,并从计算开销方面证明了它的有效性.
