Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: P-MOD: Secure Privilege-Based Multilevel Organizational Data-Sharing in
  Cloud Computing   Cloud computing has changed the way enterprises store, access and share data.
Data is constantly being uploaded to the cloud and shared within an
organization built on a hierarchy of many different individuals that are given
certain data access privileges. With more data storage needs turning over to
the cloud, finding a secure and efficient data access structure has become a
major research issue. With different access privileges, individuals with more
privileges (at higher levels of the hierarchy) are granted access to more
sensitive data than those with fewer privileges (at lower levels of the
hierarchy). In this paper, a Privilege-based Multilevel Organizational
Data-sharing scheme~(P-MOD) is proposed that incorporates a privilege-based
access structure into an attribute-based encryption mechanism to handle these
concerns. Each level of the privilege-based access structure is affiliated with
an access policy that is uniquely defined by specific attributes. Data is then
encrypted under each access policy at every level to grant access to specific
data users based on their data access privileges. An individual ranked at a
certain level can decrypt the ciphertext (at that specific level) if and only
if that individual owns a correct set of attributes that can satisfy the access
policy of that level. The user may also decrypt the ciphertexts at the lower
levels with respect to the user's level. Security analysis shows that P-MOD is
secure against adaptively chosen plaintext attack assuming the DBDH assumption
holds.The comprehensive performance analysis demonstrates that P-MOD is more
efficient in computational complexity and storage space than the existing
schemes in secure data sharing within an organization.

33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph