Cloud computing is an emerging technology which is at the peak in the IT industry. Storing , accessing and processing of data in cloud environment are the cutting edge technology used all over the world. Cloud computing provides several service models and deployment models. These features provide easy data outsourcing with the help of third party storage service providers. The storage provider must assure that the data stored by the user is secure , they can query on the data and the result of the query must also be secure and not visible to the provider. Data encryption, homomorphic encryption, secret sharing algorithms is the techniques extensively used for securing data outsourcing. Main issues associated with data storage management are CIA (Confidentiality, Integrity, and Availability). But due to the reason that single cloud suffers from many security issues , users and customers are opting for "multi-cloud". These multi-clouds are secured by various techniques and one of them is Secret Sharing Algorithms. There are many different Secret Sharing Algorithms. This paper applies Shamir's secret sharing scheme to secure data outsourcing in Multi-cloud.%云计算技术是当前IT界的最受关注的新兴技术.云环境为利用数据存储、访问和处理等前沿技术实现目标主机的全球各地随意访问,并且云计算针对客户提供了部分常用的服务模型和部署模型.这些特性使得用户能够通过第三方服务商利用简单的操作就能提供数据存储功能,而存储供应商必须确保用户存储的数据是安全的,以及确保客户可以查询数据和查询的结果也是安全的.数据加密、同态加密,秘密共享算法等技术的广泛被用于数据保护.数据存储管理的主要问题是CIA(机密性、完整性和可用性),但由于单个云所面临的许多安全问题,用户和客户更愿意选择"多重云"服务,这些多重云安全使用的各种技术,其中一个就是秘密共享算法,本文采用Shamir秘密共享算法实现多重云安全验证.
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