Attribute-Based Encryption (ABE) is one of the new visions for finegrained access control in cloud computing. Plenty of research work has been done in both academic and industrial communities. However, before ABE can be deployed in data outsourcing systems, efficient enforcement of authorization policies and policy updates are the main obstacles. Therefore, in order to solve this problem, effic...

As a new public key primitive, attribute-based encryption (ABE) is envisioned to be a promising tool for implementing fine-grained access control. To further address the concern of user access privacy, privacy-aware ABE schemes are being developed to achieve hidden access policy recently. For the purpose of secure access control, there is, however, still one critical functionality missing in th...

Aalto University, P.O. Box 11000, FI-00076 Aalto www.aalto.fi Author Hannu Pulakka Name of the doctoral dissertation Development and evaluation of artificial bandwidth extension methods for narrowband telephone speech Publisher School of Electrical Engineering Unit Department of Signal Processing and Acoustics Series Aalto University publication series DOCTORAL DISSERTATIONS 5/2013 Field of res...

We propose a new generic framework for constructing fully secure attribute based encryption (ABE) in multilinear settings. It is applicable in a generic manner to any predicates. Previous generic frameworks of this kind are given only in bilinear group settings, where applicable predicate classes are limited. Our framework provides an abstraction of dual system paradigms over composite-order gr...

The notion of attribute-based encryption (ABE) was proposed as an economical alternative to public-key infrastructures. ABE is also a useful building block in various cryptographic primitives such as searchable encryption. For ABE, it is not realistic to trust a single authority to monitor all attributes and hence distributing control over many attribute-authorities is desirable. A multi-author...

In today’s digital world Cloud computing is a revolution knowledge for stream of computing as a utility. That is providing platform and services for enormous-scale of data storage and data manage. Big Data on cloud environment analyze, storage, manage, visualization, security are some challenges that requires more timing and large computation infrastructure processing. Security in terms of data...

Attribute based encryption (ABE) has been widely applied for secure data protection in various data sharing systems. However, the efficiency of existing ABE schemes is not high enough since running encrypt and decrypt algorithms need frequent bilinear pairing operations, which may occupy too much computing resources on terminal devices. What's more, since different users may share the same attr...

Security and privacy are very important challenges for outsourced private data over cloud storages. By taking Attribute-Based Encryption (ABE) for Access Control (AC) purpose we use fine-grained AC over cloud storage. In this paper, we extend previous Ciphertext Policy ABE (CP-ABE) schemes especially for mobile and resource-constrained devices in a cloud computing environment in two aspects, a ...

Conventional acetone-butanol-ethanol (ABE) fermentation is severely limited by low solvent titer and productivities. Thus, this study aims at developing an improved Clostridium acetobutylicum strain possessing enhanced ABE production capability followed by process optimization for high ABE productivity. Random mutagenesis of C. acetobutylicum PJC4BK was performed by screening cells on fluoroace...

We propose adaptively secure attribute-based encryption (ABE) schemes for boolean formulas over large universe attributes from the decisional linear (DLIN) assumption, which allow attribute reuse in an available formula without the previously employed redundant multiple encoding technique. Thus our KP-(resp. CP-)ABE has non-redundant ciphertexts (resp. secret keys). For achieving the results, w...