A Secure and Efficient Erasure Code-based Content Transmission in Cloud Using Cp-abe Approach

-In cloud the retention of retrieval data transmission which contain collection of storage servers to enable expanded storage services .Transmission of content in cloud causes data robustness and data confidentiality .For data robustness implementation of erasure code-based content with multiple key servers are concerned for the recovery process using redundancy. For data confidentiality implementation of homomorphic integrity based on new integrity tags can be computed from old integrity tags by storage servers without involvement of the user's secret key or backup servers CPABE(Cipher policy –Attribute based encryption approach where followed to prove the security of our integrity check scheme formally, and establish the parameters for achieving for data retrival. A system for realizing complex access control on encrypted data that we call Ciphertext-Policy Attribute-Based Encryption. By using our techniques encrypted data can be kept confidential even if the storage server is untrusted moreover, our methods are secure against collusion attacks. Previous Attribute Based Encryption systems used attributes to describe the encrypted data and built policies into user’s keys, while in our system attributes are used to describe a user’s credentials, and a party encrypting data determines a policy for who can decrypt.