Attribute-based Access to Scalable Media in Cloud-assisted Content Sharing Networks.
ABSTRACT
This
paper presents a novel Multi-message Cipher text Policy Attribute-Based
Encryption (MCP-ABE) technique, and employs the MCP-ABE to design an access
control scheme for sharing scalable media based on data consumers’ attributes
(e.g., age, nationality, or gender)rather than an explicit list of the
consumers’ names. The scheme is efficient and flexible because MCP-ABE allows a
content provider to specify an access policy and encrypt multiple messages
within one Cipher text such that only the users whose attributes satisfy the
access policy can decrypt the Cipher text. Moreover, the paper shows how to
support resource-limited mobile devices by offloading computational intensive
operations to cloud servers while without compromising data privacy
Existing System:
A
promising approach to access control in content sharing services is to empower
users to enforce access controls on their data directly, rather than through a
central administrator. However, this requires flexible and scalable
cryptographic key management to support complex access control policies. A
native access control solution is to assign one key for each user attribute,
distribute the appropriate keys to users who have the corresponding attributes,
and encrypt the media with the attribute keys repeatedly Another method is to
classify users into different roles based on their attributes, assign role keys
to users, and then encrypt the content using the role keys. However, this
approach results in high complexity, i.e., the number of keys for each user and
the number of cipher texts for one message are on the order of where is the
number of all possible user attributes. Both of these solutions suffer from the
rigid and inflexible definition of the underlying access control policies. A
remedy to this problem is employing Ciphertext Policy Attribute-Based
Encryption (CP-ABE). In CP-ABE, a Ciphertext is embedded with an access control
policy, or access policy for short, associated with user attributes. A
recipient of the ciphertext is able to decrypt the ciphertext only if her
attributes satisfy the access policy in the ciphertext. CP-ABE can be viewed as
a one-to-many public key encryption scheme and hence enables a data owner to
grant access to an unknown set of users. Nonetheless, existing CP-ABE schemes
merely deliver one encrypted message per ciphertext to all authorized users and
are not optimal for efficient sharing of scalable media.
Disadvantages of Existing System:
v
In an existing system solution is flexible, but
it is vulnerable to collusion attack.
v
The existing method is to classify users into
different roles based on their attributes, assign role keys to users, and then
encrypt the content using the role keys. However, this approach results in high
complexity.
v
Existing CP-ABE schemes merely deliver one
encrypted message per ciphertext to all authorized users and are not optimal
for efficient sharing of scalable media.
Proposed System:
In
this paper we present an access control scheme for scalable media. The scheme
has several benefits which make it especially suitable for content delivery.
For example, it is extremely scalable by allowing a data owner to grant data
access privileges based on the data consumers’ attributes (e.g., age,
nationality, gender) rather than an explicit list of user names; and it ensures
data privacy and exclusiveness of access of scalable media by employing
attribute-based encryption. For this purpose, we introduce a novel
Multi-message Ciphertext Policy AttributeBased Encryption (MCP-ABE) technique.
MCP-ABE encrypts multiple messages within one ciphertext so as to
enforceflexible attribute-based access control on scalable media. Specifically,
the scheme constructs a key graph which matches users’ access privileges,
encrypts media units with the corresponding keys, and then encrypts the key
graph with MCP-ABE; only those data consumers with the required user attributes
can decrypt the encryption of the key (sub) graph and then decrypt the
encrypted media units. To cater for resource-limited mobile devices, the scheme
offloads computational intensive operations to cloud servers while without
compromising user data privacy.
Advantages of Proposed System:
v
The present scheme is also secure against user
collusion attacks due to use of attribute-based encryption.
v
The experiments demonstrate that the present
scheme is applicable on smartphone, especially when a cloud platform is
available.
v
We present an access control scheme for scalable
media. The scheme has several benefits which make it especially suitable for
content delivery
System Architecture:
System Requirement
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
XP.
•
Coding Language : ASP.NET, C#.Net.
•
Data Base : SQL
Server 2005
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