ID	原文	译文
45756	用户可以通过云快捷、方便地获取信息和服务。	Users can access data and retrieve service easily and quickly in cloud.
45757	云端数据的机密性、完整性直接关系到天地一体化信息网络的数据安全，所以云端数据多以密文形式进行流通。	The confidentiality and integrity of the data cloud have a direct correspondence to data security of the space-ground integration information network.
45758	云端访问控制技术的研究则需要面向密文数据，	Thus the data in cloud is transferred with encrypted form to protect the information.
45759	同时兼顾复杂环境下的多要素描述需求。	As an important technology of cloud security, access control should take ac-count of multi-factor and ciphertext to satisfy the complex requirement for cloud data protection.
45760	以此为背景，结合代理重加密技术，提出一种云端多要素访问控制（PRE-MFAC, proxy re-encryption based multi-factor access control）方案，	Based on this, a proxy re-encryption based multi-factor access control (PRE-MFAC) scheme was proposed.
45761	首先，明确设计目标和前提假设；	Firstly, the aims and assumptions of PRE-MFAC were given.
45762	其次，构造具体方案，描述 PRE-MFAC 系统模型和相关算法；	Secondly, the system model and algorithm was defined.
45763	最后，对 PRE-MFAC的安全性、特点进行比较分析。	Finally, the security and properties of PRE-MFAC were analyzed.
45764	PRE-MFAC 通过将代理重加密技术和多要素访问控制融合，实现云端密文数据的多要素化授权管理，	The proposed scheme has combined the PRE and multi-factor access control together and realized the multi-factor permission management of ciphertext in cloud.
45765	同时，充分发挥云端服务器的运算和存储能力，降低个人用户加解密运算量和密钥管理难度。	Meanwhile, it can make the best possible use of clouding computing and storing, then reduce the difficulty of personal user in cryptographic computing and key managing.