Cloud computing provides a wide platform for information sharing. Users can access data and retrieve service easily and quickly. Generally, the data in cloud are transferred with encrypted form to protect the informat...Cloud computing provides a wide platform for information sharing. Users can access data and retrieve service easily and quickly. Generally, the data in cloud are transferred with encrypted form to protect the information. As an important technology of cloud security, access control should take account of multi-factor and ciphertext to satisfy the complex requirement for cloud data protection. We propose a proxy re-encryption (PRE) based multi-factor access control (PMAC) for cipher text in the above background. The PMAC adapts to the privacy and the protection of data confidently. We explain the motivation and some assumptions of PMAC at first. Then we define system model and algorithm. The system model and algorithm show how to create the data with corresponding accessing Policy and how to grant and revoke the nermission.展开更多
有越来越多的用户选择云为其进行存储、运算、共享等数据处理工作,因此云端数据量与日俱增,其中不乏敏感数据和隐私信息.如何对用户托管于云端的数据进行授权管理,保证数据机密性、访问授权有效性等至关重要.为此,提出一种基于代理重加...有越来越多的用户选择云为其进行存储、运算、共享等数据处理工作,因此云端数据量与日俱增,其中不乏敏感数据和隐私信息.如何对用户托管于云端的数据进行授权管理,保证数据机密性、访问授权有效性等至关重要.为此,提出一种基于代理重加密(proxy re-encryption,简称PRE)的云端数据访问授权的确定性更新方案(proxy re-encryption based assured update scheme of authorization,简称PAUA).首先将提出PAUA方案的前提假设和目标,其次论述系统模型和算法,最后对PAUA进行讨论和分析.PAUA方案将减轻用户在数据共享时的计算量,同时将重加密密钥进行分割管理,实现授权变更时,密钥的确定性更新.展开更多
云存储服务在以其低成本、高扩展等优势获得广泛青睐的同时,也为实现信息资产安全与隐私保护带来了极大的冲击与挑战.目前,安全已成为云存储服务亟待解决的重要问题.提出了一种可信的云存储控制模型(Trusted Control Model of CloudStor...云存储服务在以其低成本、高扩展等优势获得广泛青睐的同时,也为实现信息资产安全与隐私保护带来了极大的冲击与挑战.目前,安全已成为云存储服务亟待解决的重要问题.提出了一种可信的云存储控制模型(Trusted Control Model of CloudStorage,TCMCS).TCMCS通过密文访问控制及完整性验证对用户数据进行预处理来保证数据的机密性与完整性;引入可信第三方存储密钥信息,以实现安全、可靠的数据共享;借鉴中间件的设计思想以屏蔽不同云存储平台之间的差异以及分离数据操作过程中的安全操作与业务逻辑.基于安全的多方计算理论,证明了TCMCS的安全性.仿真实验表明,TCMCS在不降低云存储服务平台数据操作性能的基础上,保证了数据的安全性.展开更多
基金the National Natural Science Foundation of China(Nos.61702266 and 61572255)the Natural Science Foundation of Jiangsu Province(Nos.BK20150787 and BK20141404)
文摘Cloud computing provides a wide platform for information sharing. Users can access data and retrieve service easily and quickly. Generally, the data in cloud are transferred with encrypted form to protect the information. As an important technology of cloud security, access control should take account of multi-factor and ciphertext to satisfy the complex requirement for cloud data protection. We propose a proxy re-encryption (PRE) based multi-factor access control (PMAC) for cipher text in the above background. The PMAC adapts to the privacy and the protection of data confidently. We explain the motivation and some assumptions of PMAC at first. Then we define system model and algorithm. The system model and algorithm show how to create the data with corresponding accessing Policy and how to grant and revoke the nermission.
文摘有越来越多的用户选择云为其进行存储、运算、共享等数据处理工作,因此云端数据量与日俱增,其中不乏敏感数据和隐私信息.如何对用户托管于云端的数据进行授权管理,保证数据机密性、访问授权有效性等至关重要.为此,提出一种基于代理重加密(proxy re-encryption,简称PRE)的云端数据访问授权的确定性更新方案(proxy re-encryption based assured update scheme of authorization,简称PAUA).首先将提出PAUA方案的前提假设和目标,其次论述系统模型和算法,最后对PAUA进行讨论和分析.PAUA方案将减轻用户在数据共享时的计算量,同时将重加密密钥进行分割管理,实现授权变更时,密钥的确定性更新.
文摘云存储服务在以其低成本、高扩展等优势获得广泛青睐的同时,也为实现信息资产安全与隐私保护带来了极大的冲击与挑战.目前,安全已成为云存储服务亟待解决的重要问题.提出了一种可信的云存储控制模型(Trusted Control Model of CloudStorage,TCMCS).TCMCS通过密文访问控制及完整性验证对用户数据进行预处理来保证数据的机密性与完整性;引入可信第三方存储密钥信息,以实现安全、可靠的数据共享;借鉴中间件的设计思想以屏蔽不同云存储平台之间的差异以及分离数据操作过程中的安全操作与业务逻辑.基于安全的多方计算理论,证明了TCMCS的安全性.仿真实验表明,TCMCS在不降低云存储服务平台数据操作性能的基础上,保证了数据的安全性.