CLOUD STORAGE ENVIRONMENT IN A SECURE CLIENT SIDE DEDUPLICATION

Data mining brings forth lot of information extraction security and privacy
concerns for user's sensitive data and it ensures security to both inside and outside attacks
in cloud storage. Traditional encryption, while providing data confidentiality, is
incompatible with data Deduplication. So for more advanced security it requires a stronger
encryption system. Traditional encryption allows different users to encrypt their data with
their own keys. Thus, identical data of different users leads to attaining different cipher
texts; this affects deduplication of identical data. Convergent encryption has been
suggested in order to enforce data confidentiality for making Deduplication feasible. It
encrypts or decrypts a data copy with a convergent key, A cryptographic hash value is
generated by computing the contents of the data, which are uploaded. After generating the
key and encryption of data, users gain the keys and send back the cipher text to the
storage. Since the encryption operation is deterministic and obtained by comparing the
actual data, identical data copies will generate the same convergent key and hence the same
Ciphertext. Data Deduplication has been a conventional method in maintaining validity in
the files and to remove same data files. It helps to reduce the amount of storage space and
save bandwidth during upload operation. To ensure the confidentiality of sensitive data
while supporting Deduplication, the convergent encryption technique has been suggested to
encrypt the data before outsourcing or deploying. The objective is for making the better
environment for data security and makes the attempt to formally address the problem of
authorized data Deduplication in Cloud Storage.