As an emergent technology, cloud 1 has placed many challenges in different aspects of data and 2 handling. 3 and privacy, portability, interoperability, computing 4 , and reliability and availability are the 5 challenges. 云计算作为一种新兴的技术,在数据和信息处理的各个方面都提出了很多挑战。隐私、可移植性、互操作性、计算性能、可靠性和可用性是主要的挑战。