IMAGE PIXEL BASED GRAPHICAL AUTHENTICATION SYSTEM

Abstract : In three level graphical, text and color file security system the authentication is done by image representation password. Data sharing is an important functionality in cloud storage. In this article, we show how to securely, efficiently, and flexibly share data with others in cloud storage. We describe new public-key cryptosystems which produce constant-size cipher texts such that efficient delegation of decryption rights for any set of cipher texts are possible. The novelty is that one can aggregate any set of secret keys and make them as compact as a single key, but encompassing the power of all the keys being aggregated. In other words, the secret key holder can release a constant-size aggregate key for flexible choices of cipher text set in cloud storage, but the other encrypted files outside the set remain confidential.

 EXISTING SYSTEM :

 There exist several expressive ABE schemes where the decryption algorithm only requires a constant number of pairing computations. Recently, Green et al. proposed a remedy to this problem by introducing the notion of ABE with outsourced decryption, which largely eliminates the decryption overhead for users. Based on the existing ABE schemes, Green et al. also presented concrete ABE schemes with outsourced decryption. In these existing schemes, a user provides an untrusted server, say a proxy operated by a cloud service provider, with a transformation key TK that allows the latter to translate any ABE ciphertext CT satisfied by that user’s attributes or access policy into a simple ciphertext CT’, and it only incurs a small overhead for the user to recover the plaintext from the transformed ciphertext CT’. The security property of the ABE scheme with outsourced decryption guarantees that an adversary (including the malicious cloud server) be not able to learn anything about the encrypted message; however, the scheme provides no guarantee on the correctness of the transformation done by the cloud server. In the cloud computing setting, cloud service providers may have strong financial incentives to return incorrect answers, if such answers require less work and are unlikely to be detected by users.

 

 

 PROPOSED SYSTEM :

 In the proposed System, Graphical Password Security system is defined as the creation and proliferation of the personal computer, the globalization of ideas and other human acts, and the use of technology in exchanging files and providing access to more people. Important communication files and documents via other related documents are often combined to create a multifaceted instructional delivery system. The fundamental method to unite the admin will check the user's id then only it will allowed to access the system. we proposed in our system even we have the existing system because the new system is very simplicity, easy to access, attractive web page, and includes user friendly, can log in anyway/anytime, user can easily learn the functions of its buttons, student not in IT field also can use the this easily without any problem and so on. We included these kind elements because the student will enjoy and interest to using the system.