In recent years cloud computing has achieved great development as it provides economic and convenient services. Cloud data services are an interesting and the latest way for storing enterprise data as more companies and users are uploading their data to cloud. The problem of data privacy and security needs to be addressed efficiently to fully utilize the power of cloud data services. Data security is a crucial aspect in cloud data storage and transmission. The use of data hiding methods for the security in data transmission and data storage would be very effective in securing cloud data. In this paper, we present a survey of data encryption methods, steganography methods and hybrid methods, that have been extensively applied in this context. However, majority of these methods suffer the overloads involved with encryption techniques and also have heavy computational time. A new method that specifically addresses security of cloud without the usage of encryption process is essential for reducing the overheads of encryption techniques, thereby improving the overall performance. At this juncture, data hiding techniques are considered to be more suitable and potential substitute over the encryption-based cloud data storage security techniques existing in the literature. We propose to build such data hiding techniques as future work.

Data Hiding, Cloud data security, Encryption Techniques, Data aggregation

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