Cloud computing is the paradigm used to provide resource on share basis to multiple machines. Due to availability of resources this mechanism becoming extremely popular for accessing resources as and when desired by machines. Reliability however is the issue associated with cloud computing. Data transferred and stored over the cloud will be under siege due to the malicious access or attacks. This paper present the comprehensive survey of techniques used in order to encrypt the data and enhance reliability of cloud. Cloud reliability enhancement is ensured using the encryption algorithms which are researched over the past era. Efficient parameters are extracted and qualitative comparison is presented to depict the efficient encryption mechanism that can be used in future works.

Cloud Computing, Reliability, Encryption

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