Generic and efficient constructions of attribute based encryption with verifiable outsourced decryption

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Generic and Efficient Constructions of
Attribute-Based Encryption with Verifiable
Outsourced Decryption
Abstract
Attribute-based encryption (ABE) provides a mechanism for complex access
control over encrypted data. However in most ABE systems, the ciphertext size
and the decryption overhead, which grow with the complexity of the access policy,
are becoming critical barriers in applications running on resource-limited devices.
Outsourcing decryption of ABE ciphertexts to a powerful third party is a
considerable manner to solve this problem. Since the third party is usually believed
to be untrusted, the security requirements of ABE with outsourced decryption
should include privacy and verifiability. Namely, any adversary including the third
party should learn nothing about the encrypted message, and the correctness of the
outsourced decryption is supposed to be verified efficiently. We propose generic
constructions of CPA-secure and RCCA-secure ABE systems with verifiable
outsourced decryption from CPA-secure ABE with outsourced decryption,
respectively. We also instantiate our CPA-secure construction in the standard
model and then show an implementation of this instantiation. The experimental
results show that, compared with the existing scheme, our CPA-secure
construction has more compact ciphertext and less computational costs. Moreover,
the techniques involved in the RCCA-secure construction can be applied in
generally constructing CCA-secure ABE, which we believe to be of independent
interest.

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Copyright © 2015 LeMeniz Infotech. All rights reserved
Page number 2
LeMeniz Infotech
36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
Pondicherry-605 005.
Call: 0413-4205444, +91 9566355386, 99625 88976.
Web : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
EXISTING SYSTEM
Outsourcing decryption of ABE ciphertexts to a powerful third party is a
considerable manner. The third party is usually believed to be untrusted, the
security requirements of ABE with outsourced decryption should include privacy
and verifiability.
DRAWBACK OF EXISTING SYSTEM
 Complexity of access policy to the ciphertext and decryption overhead on
computational cost.
 Applications running on resource-limited devices.
PROPOSED SYSTEM
Generic constructions of CPA-secure and RCCA-secure ABE systems with
verifiable outsourced decryption from CPA-secure ABE with outsourced
decryption, respectively. We also instantiate our CPA-secure construction in the
standard model and then show an implementation of this instantiation.
ADVANTAGE OF PROPOSED SYSTEM
 More compact ciphertext and less computational costs.
 RCCA-secure construction with CCA-secure ABE, which we believe to be
of independent interest.
 Contributes to access control over encrypted data.

Do Your Projects With Domain Experts…
Copyright © 2015 LeMeniz Infotech. All rights reserved
Page number 3
LeMeniz Infotech
36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
Pondicherry-605 005.
Call: 0413-4205444, +91 9566355386, 99625 88976.
Web : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
SYSTEM SPECIFICATION
Hardware Requirements
System : Pentium IV 2.4 GHz
Hard Disk : 40 GB
Floppy Drive : 1.44 Mb
Monitor : 15 VGA Colour
Mouse : Logitech
Ram : 512 Mb
Software Requirements
Operating system : Windows Family
Tools : eclipse
Technology Used : Java
Backend Used : SQLITE

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