Mona:
Secure Multi-Owner Data Sharing for Dynamic Groups in the Cloud
ABSTRACT:
With the character of low maintenance,
cloud computing provides an economical and efficient solution for sharing group
resource among cloud users. Unfortunately, sharing data in a multi-owner manner
while preserving data and identity privacy from an untrusted cloud is still a
challenging issue, due to the frequent change of the membership. In this paper,
we propose a secure multiowner data sharing scheme, named Mona, for dynamic
groups in the cloud. By leveraging group signature and dynamic broadcast encryption
techniques, any cloud user can anonymously share data with others. Meanwhile,
the storage overhead and encryption computation cost of our scheme are
independent with the number of revoked users. In addition, we analyze the
security of our scheme with rigorous proofs, and demonstrate the efficiency of
our scheme in experiments.
EXISTING SYSTEM:
To preserve data privacy, a basic
solution is to encrypt data files, and then upload the encrypted data into the
cloud. Unfortunately, designing an efficient and secure data sharing scheme for
groups in the cloud is not an easy task.
In the existing System data owners store
the encrypted data files in untrusted storage and distribute the corresponding
decryption keys only to authorized users. Thus, unauthorized users as well as
storage servers cannot learn the content of the data files because they have no
knowledge of the decryption keys. However, the complexities of user participation
and revocation in these schemes are linearly increasing with the number of data
owners and the number of revoked users, respectively.
DISADVANTAGES
OF EXISTING SYSTEM:
§ In
the existing Systems, identity privacy is one of the most significant obstacles
for the wide deployment of cloud computing. Without the guarantee of identity
privacy, users may be unwilling to join in cloud computing systems because
their real identities could be easily disclosed to cloud providers and
attackers. On the other hand, unconditional identity privacy may incur the
abuse of privacy. For example, a misbehaved staff can deceive others in the
company by sharing false files without being traceable.
§ Only
the group manager can store and modify data in the cloud
§ The
changes of membership make secure data sharing extremely difficult the issue of
user revocation is not addressed
PROPOSED SYSTEM:
1. We propose a secure multi-owner data
sharing scheme. It implies that any user in the group can securely share data
with others by the untrusted cloud.
2. Our proposed scheme is able to
support dynamic groups efficiently. Specifically, new granted users can
directly decrypt data files uploaded before their participation without
contacting with data owners. User revocation can be easily achieved through a novel
revocation list without updating the secret keys of the remaining users. The
size and computation overhead of encryption are constant and independent with
the number of revoked users.
3. We provide secure and
privacy-preserving access control to users, which guarantees any member in a group
to anonymously utilize the cloud resource. Moreover, the real identities of
data owners can be revealed by the group manager when disputes occur.
4. We provide rigorous security
analysis, and perform extensive simulations to demonstrate the efficiency of
our scheme in terms of storage and computation overhead.
ADVANTAGES
OF PROPOSED SYSTEM:
ü Any
user in the group can store and share data files with others by the cloud.
ü The
encryption complexity and size of ciphertexts are independent with the number
of revoked users in the system.
ü User
revocation can be achieved without updating the private keys of the remaining
users.
ü A
new user can directly decrypt the files stored in the cloud before his
participation.
SYSTEM ARCHITECTURE:
ALGORITHMS USED:
ü Signature
Generation
ü Signature
Verification
ü Revocation
Verification
ALGORITHMS DESCRIPTION:
ü Signature Generation:
ü Signature Verification:
ü Revocation Verification
SYSTEM REQUIREMENTS:
HARDWARE REQUIREMENTS:
·
System : Pentium IV 2.4 GHz.
·
Hard Disk : 40 GB.
·
Monitor :
15 inch VGA Colour.
·
Mouse :
Logitech Mouse.
·
Ram : 512 MB
·
Keyboard :
Standard Keyboard
SOFTWARE REQUIREMENTS:
·
Operating System : Windows XP.
·
Coding Language : ASP.NET, C#.Net.
·
Database :
SQL Server 2005
REFERENCE:
Xuefeng Liu, Yuqing Zhang, Boyang Wang,
and Jingbo Yan, “Mona: Secure Multi-Owner Data Sharing for Dynamic Groups in
the Cloud”, IEEE TRANSACTIONS ON
PARALLEL AND DISTRIBUTED SYSTEMS, VOL. 24, NO. 6, JUNE 2013.
