Secure Outsourcing Scheme for Mobile Devices on Cloud Storage Services Using Secret Sharing Scheme

There is a big demand in the cloud storage service to store data via network from the rapid spread of mobile devices in recent years. Because there is a need to store data in safety in these services, Secret Sharing Scheme (SSS) which can improve the availability and confidentiality as a technology suitable for it has attracted attention. However, processing of secret sharing scheme which data capacity would increase is not suitable for processing by mobile devices of poor communication bandwidth. On the other hand, when outsourcing of SSS to outside server, it is necessary to combine encryption such as AES because of the risk of information leakage, and key management costs occur due to it. In this paper, we propose a secure outsourcing scheme for mobile devices using SSS and encryption method without key management. Moreover, we evaluated processing load and communication costs for the proposed scheme.