关键词: 多云存储, 加密, 纠删码, SIMD并行, 安卓

Abstract: Abstract: Because of a series of security problems in the cloud storage and the improvement of mobile Internet and the rise of the smart phone. This paper designed a multi-cloud storage system based on the Android platform. Firstly, this system adopted data encryption process to ensure the confidentiality of data, then sliceed the data, using erasure code to achieve fault tolerance aiming at ensuring data integrity, and finally a plurality of pieces of data was separated to a different cloud storage service providers on solving the problem of vendor lock-in, ensuring service availability. For the problem of multiple service provider security certification, this system designed a token protection mechanism based on local salt method. Because of weak computing capacity on Android equipment, it also designed a multi-level security mechanism, using the combination of different encryption and encoding methods to meet the users’ different needs of a balance between data processing speed and security. This system used SIMD technology for key operations such as encoding and encryption algorithm with parallel optimization for a better performance of reading and writing. The experimental results showed that the multi-cloud storage system based on Android achieves security cloud storage for users’ data, and provided a satisfactory rate of read and write throughput.

Key words: Multi-Cloud storage, Encryption, Erasure code, SIMD parallel optimization, Android