Salvation of Information Exchange Over Cloud Service Provider by Predicate Based Algorithm and Finest Access Control by Attribute Based Signature

Storage on cloud space is one of the impeach issues towards salvation of information. This challenging issue of security leads to development of different cryptographic methods. Cryptographic methods are designed to achieve system stability, data access, key management etc. One of the most excellent manners for depot of information on a storehouse like cloud is Attribute-based encryption (ABE). This thesis concentrates on combination of Cipher-policy attribute-based encryption (CP-ABE) and Attribute-based signature (ABS) yield assurance of unforgeability and secrecy for information swapping from cloud service provider (CSP) to subscriber. Information swapping to the CSP is done using CP-ABE encryption method. CP-ABE tool kit encrypts documents based on attributes of user. It includes master_key, public_key and private_key for individual users. Information can be decrypted by the users who possess the correct attributes. Hence, when subscriber requires information to be fetched from CSP, the CSP will apply ABS to validate information for correct subscriber.