Secure de-duplication in cloud using Convergent Encryption.

Data de-duplication is a well-known technique to reduce storage space requirement and upload bandwidth in cloud storage by eliminating redundant data and keeping only one physical copy and referring other redundant data to that copy. In traditional encryption, identical data copies of different users leads to different cipher-texts, making de-duplication impossible. To overcome this limitation, convergent encryption is used. It encrypts or decrypts a data copy with a convergent key derived by computing cryptographic hash value of the data copy itself. Using De-key, de-duplication to the convergent keys is applied and secret sharing is leveraged