Secure Deduplication in Cloud Backup Services

Data deduplication is the technique which is used for avoiding or removing the duplication of the data, and it is frequently used in cloud storage to reduce the storage space of the data and the bandwidth. To perform the secure deduplication in the cloud its a challenge. For provide the data security over the cloud convergent encryption technique is widely adopted. Convergent encryption technique is useful for efficiently and reliably manage the large number of convergent keys. The primary challenge is to correctly address the problem of achieving efficient and reliable key management in secure deduplication. Secondary data resource raises security and privacy concerns. Trusted third-party cloud service providers in the proposed system provide the confidentiality of data, reliability checking and also the access control mechanisms by number of internal and external attacks. As Deduplication improves the storage space, bandwidth efficiency but it is conflicting with the convergent encryption technique. The convergent encryption technique requires the different users to encrypt their data with their data with their respective key. As the same data copies of different user will confirm the method to individual cipher texts and making deduplication checking of data unfeasible. Convergent encryption provides an adequate option to implement data confidentiality while realizing deduplication. Convergent encryption is the technique which encrypts and decrypts the data copy with convergent key and which is calculated by cryptographic hash value of the content of the data copy itself. In key generation and data encryption technique users holds the key and send the cipher text to the cloud service provider. Encryption is the technique which deterministic and the identical data copies will create the similar convergent key and the same cipher text.