Mutual trust in computer security is known as accepting on the same security architecture by two participating parties. Today, most of the users prefer to keep their data in the cloud with Cloud Storage Providers (CSP), some of the popular cloud storage providers are Drop Box, SkyDrive, and Google Drive and so on. Most of the cloud storage providers operate on secured http layer, therefore they provide underneath security for any data transmission. However, users often do not know in what ways the cloud service providers uses his data. Security of the critical data (for ex. Critical health record) is extremely difficult for the user to trust the service provider completely, and keep the record as it is. Beside this, once the storage link of the cloud is shared user has very little control on the link sharing. In the past several techniques have been proposed to provide security to the data in the cloud, however, not significant work has been carried out, towards offering a solution to address the problem of lack of mutual trust. In this work we develop a unique third party solution for providing mutual trust between the user and the cloud service provider. Our application takes a user key, encrypts every contents that need to be stored in a cloud space and then stores the data. While accessing the same data user needs to provide his key, then the encrypted data is downloaded from the cloud and is decrypted locally. We use symmetric key encryption as middle layer security for the mutual trust. We also analyze the performance of three very popular symmetric key encryption techniques such as AES, 3DES, RC2 and evaluate the performance of the same. The performance of the different algorithms varies according to data loads.

Cloud Storage Provider(CSP), Mutual Trust, Trusted Third Party, Access Control, AES, 3DES, RC2.

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