Secure Ciphertext Policy Using Blowfish Hybridized Weighted Attribute-Based Encryption

Abstract

There are lots of application which are been used by the people where a user’s data has to be protected from the attackers who steal the data by using fake identities which makes difficult to find the real culprit. The main issue is to give strong security to the data and to minimize computational cost with an efficient key management system. We propose a new encryption method in this paper, based on user attributes and access control policy using blowfish which is hybridized and weighted encryption which is a combination of features from two different algorithms to provide a high security to user data and to generate key efficiently. The two algorithms ciphertext policy attribute encryption with access control policy and the hierarchical identity-based encryption with weighted attributes are included. Here, based on the priority, the weights are assigned to the attributes and then the message is combined with access control policy given by the user and encrypted. This algorithm is used to find the culprit who is misusing the application. Also we can add that person to the blacklist, and all the accounts associated with that identity can also be blacklisted. The proposed system provides multi-authority security, efficiency, collusion resistant, secure against chosen plain text attack and reliable.