Attributes based encryption with verifiable outsourced decryption
Attribute-based encryption (ABE) is a public-key based one-to-many encryption that allows users to encrypt and decrypt data based on user attributes. A promising application of ABE is flexible access control of encrypted data stored in the cloud, using access polices and ascribed attributes associated with private keys and ciphertexts.One of the main efficiency drawbacks of the existing ABE schemes is that decryption involves expensive pairing operations and the number of such operations grows with the complexity of the access policy. Recently, Green et al. proposed an ABE system with outsourced decryption that largely eliminates the decryption overhead for users. In such a system, a user provides an untrusted server, say a cloud service provider, with a transformation key that allows the cloud to translate any ABE cipher text satisfied by that user’s attributes or access policy into a simple cipher text, and it only incurs a small computational overhead for the user to recover the plaintext from the transformed cipher text. Security of an ABE system with outsourced decryption ensures that an adversary (including a malicious cloud) will not be able to learn anything about the encrypted message; however, it does not guarantee the correctness of the transformation done by the cloud. In this paper, we consider a new requirement of ABE with outsourced decryption: verifiability. Informally, verifiability guarantees that a user can efficiently check if the transformation is done correctly. We give the formal model of ABE with verifiable outsourced decryption and propose a concrete scheme. We prove that our new scheme is both secure and verifiable, without relying on random oracles. Finally, we show an implementation of our scheme and result of performance measurements, which indicates a significant reduction on computing resources imposed on users. http://kaashivinfotech.com/ http://inplanttrainingchennai.com/ http://inplanttraining-in-chennai.com/ http://internshipinchennai.in/ http://inplant-training.org/ http://kernelmind.com/ http://inplanttraining-in-chennai.com/ http://inplanttrainingchennai.com/
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Attributes based encryption with verifiable outsourced decryption
- 1. IEEE TRANSACTIONS ON INFORMATION FORENSICS AND SECURITY, VOL.8, NO.8, JULY 2014. Attributes based encryption with verifiable outsourced decryption
- 2. Abstract Attribute-based encryption (ABE) is a public-key based one-to-many encryption that allows users to encrypt and decrypt data based on user attributes. A promising application of ABE is flexible access control of encrypted data stored in the cloud, using access polices and ascribed attributes associated with private keys and ciphertexts.One of the main efficiency drawbacks of the existing ABE schemes is that decryption involves expensive pairing operations and the number of such operations grows with the complexity of the access policy. Recently, Green et al. proposed an ABE system with outsourced decryption that largely eliminates the decryption overhead for users. In such a system, a user provides an untrusted server, say a cloud service provider, with a transformation key that allows the cloud to translate any ABE cipher text satisfied by that user’s attributes or access policy into a simple cipher text, and it only incurs a small computational overhead for the user to recover the plaintext from the transformed cipher text. Security of an ABE system with outsourced decryption ensures that an adversary (including a malicious cloud) will not be able to learn anything about the encrypted message; however, it does not guarantee the correctness of the transformation done by the cloud. In this paper, we consider a new requirement of ABE with outsourced decryption: verifiability. Informally, verifiability guarantees that a user can efficiently check if the transformation is done correctly. We give the formal model of ABE with verifiable outsourced decryption and propose a concrete scheme. We prove that our new scheme is both secure and verifiable, without relying on random oracles. Finally, we show an implementation of our scheme and result of performance measurements, which indicates a significant reduction on computing resources imposed on users.
- 3. Proposed System In the proposed system the evaluation and accuracy of the attributes are traced in order to provide better encryption/decryption strategy while transferring data from source to destination. The generation of the public and private key using the attributes and master key with proxies and access structure attributes are same as the existing system. The combination of the public and private key generates the message. The verification of the outsourced decryption are also made using the combination of private key and parameter attribute that generates the transform and retrieve key similarly as the existing system. Additionally the concept of proxy verification are made since the proxies are intermediate between the source and the destination. The validation are made using the private key check with the proxies and the source. The attribute used are checked for its uniqueness so as to avoid the same attribute for the common parametric data. the encryption of data are validated using the public. Hence this system overcomes the drawback of the existing system.
- 4. Existing System In the existing system the concepts of attribute based encryption and verifiable outsourced decryption is formulated to transfer a data from source to destination. There are two keys such as private and public key are evolved. And the combination of the keys generates the message that has to transfer from one end to other. The attributes of the data as well as the master secret key are analyzed by the proxies so as to generate a private key. The attributes of the data as well as the master key are encrypted directly by access structure attribute so as to generate a public key. The encrypted message has to decrypt and the decrypted information should checked with the original data in order to ensure the originality after the encryption/decryption process. Hence the combination of private key with parameter attributes generates transform and retrieve key. Where transform key generates partial cipher key that has to passed to the retrieve key so as to generated the original message. The main drawback over the existing system is that there is no proper verification with the proxies. And the attributes considered to frame the message are not unique in case of common parametric data.
- 5. System Requirements Hardware Requirements: System : Pentium IV and above. Hard Disk : 40 GB or Above. Monitor : VGA and High resolution monitor Mouse : Logitech. Ram : 1 GB or Above Software Requirements: Operating system : Windows VISTA or Above. Front End : Microsoft Visual Studio 2010 (.NetFramework 4.0) Coding Language : C# Backend : SQL Server 2008 R2