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Identity-Based Encryption with Outsourced

Revocation in Cloud Computing

ABSTRACT

In this paper, aiming at tackling the critical issue of identity revocation, we introduce outsourcing computation into IBE for the first time and propose a revocable IBE scheme in the server-aided setting. Our scheme offloads most of the key generation related operations during key-issuing and key-update processes

to a Key Update Cloud Service Provider, leaving only a constant number of simple operations for PKG and users to perform locally. This goal is achieved by utilizing a novel collusion-resistant technique: we employ a hybrid private key for each user, in which an AND gate is involved to connect and bound the identity component and the time component.

EXISTING SYSTEM	PROPOSED SYSTEM
EXISTING SYSTEM:- One of the main efficiency drawbacks of IBE is the overhead computation at Private Key Generator (PKG) during user revocation.  Efficient revocation has been well studied in traditional PKI setting, but the cumbersome management of certificates is precisely the burden that IBE strives to alleviate	PROPOSED SYSTEM:- We introduce outsourcing computation into IBE and propose a revocable scheme in which the revocation operations are delegated to CSP. Based on the system model proposed, we are able to define the outsourced revocable IBE scheme.
EXISTING ALGORITHM :- Encryption algorithm.	PROPOSED ALGORITHM :- Key Generation and Encryption algorithm.
ALGORITHM   DEFINITION:- To improve upon the scalability of the above solutions, one-to-many encryption methods such as ABE can be used.	ALGORITHM DEFINITION:- In a ciphertext policy attribute-based encryption scheme, each user’s private key is associated with a set of attributes representing their capabilities.
DRAWBACKS:- Secure data sharing among a group that counters insider threats of legitimate yet malicious users is an important research issue.	ADVANTAGES:- We implement a working prototype of the methodology and evaluate its performance based on the time consumed during various operations.  .