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Improving Privacy and Security in Decentralized

Cipher text-Policy Attribute-Based Encryption

ABSTRACT:

A privacy-preserving decentralized CP-ABE (PPDCP-ABE) is proposed to reduce the trust on the central authority and protect users’ privacy. In our PPDCP-ABE scheme, each authority can work independently without any collaboration to initial the system and issue secret keys to users. Furthermore, a user can obtain secret keys from multiple authorities without them knowing anything about his global identifier and attributes.

EXISTING SYSTEM	PROPOSED SYSTEM
EXISTING CONCEPT:- In existing we a user can acquire secret keys from multiple authorities with them Knowing his/her attributes and furthermore, a central authority is required.     Attribute-based encryption (ABE) where both the cipher text and the secret key are labeled with a set of attributes. A user can decrypt a cipher text if and only if there is a match between the attributes listed in the cipher text and the attributes held by him	PROPOSED CONCEPT:- In propose a privacy-preserving DCP-ABE (PPDCP-ABE) scheme where the central authority is not required and each authority can work independently without any cooperation.   The user must convince each authority that the attributes for which he is obtaining secret keys are monitored by the authority as the authority cannot know his attributes.
EXISTING TECHNIQUE:- privacy-preserving multi-authority Attribute-based encryption (PPMA-ABE).	PROPOSED TECHNIQUE:- Privacy-preserving decentralized CP-ABE (PPDCP-ABE).
TECHNIQUE DEFINITION:- To improve upon the scalability of the above solutions, one-to-many encryption methods such as ABE can be used.	TECHNIQUE DEFINITION:- In a cipher text policy attribute-based encryption scheme, each user’s private key is associated with a set of attributes representing their capabilities.
DRAWBACKS:- Maintenance Cost is high Security and Integrity is low.   One disadvantage of this fully distributed approach is the performance degradation.	ADVANTAGES:- Maintenance cost is low. Security is high for using the resigning keys. Can be securing data retrieval decentralized DTN enhance CP-ABE.