In distributed systems users need to share sensitive objects with others based on the recipients’ ability to satisfy a policy. Attribute-Based Encryption (ABE) is a new paradigm where such policies are specified and cryptographically enforced in the encryption algorithm itself. Ciphertext-Policy ABE (CP-ABE) is a form of ABE where policies are associated with encrypted data and attributes are a...

Although Attribute Grammars were introduced long ago, their lack of expressive-ness has resulted in limited use outside the domain of static language processing. With the new notion of Dynamic Attribute Grammars deened on top of Grammar Couples, informally presented in a previous paper, we show that it is possible to extend this expressiveness and to describe computations on structures that are...

This paper introduces object-oriented attribute grammars. These can be characterized as a notation for all classes of attribute grammars. Based on a subtype relation between grammar rules, inheritance of attributes and attribute computations are defined. With this approach, attributes local to grammar rules and the elimination of chain rules are possible without any special constructs. We prese...

Real-life data sets are often incomplete, i.e., some attribute values are missing. In this paper we compare traditional, frequently used methods of handling missing attribute values, which are based on preprocessing, with another class of methods dealing with missing attribute values in which rule induction is performed directly on incomplete data sets, i.e., handling missing attribute values a...

In practical situations, there are many dynamic covering information systems with variations of attributes, but there are few studies on related family-based attribute reduction of dynamic covering information systems. In this paper, we first investigate updated mechanisms of constructing attribute reducts for consistent and inconsistent covering information systems when varying attribute sets ...

Now a day’s everyone storing there data in cloud because we can’t depends on hard drives if they crash one can’t have backup for ever data. Famous Cloud storage applications are Drop box, Google drive, Sky drive, Box, Amazon cloud drive, Surdoc and Apple icloud. In cloud data security is provided by various security algorithms. In our research we have chosen attribute based encryption technique...

class Element { attribute string name; attribute int position; abstract boolean isConnectedTo(Element n); string changeNameTo(string s); };boolean isConnectedTo(Element n); string changeNameTo(string s); }; abstract class Node extends Element {class Node extends Element { attribute set incomingLinks; attribute set outgoingLinks; boolean addIncomingLink(Link k); }; class ANode extend...

Both internal software properties, such as cohesion and coupling, and external software properties, such as performance or security, have been extensively studied [2,11,13]. In this paper we pose a metric for an external property, security vulnerability, using aspects from coupling, which is an internal property. We introduce two metrics, Average Vulnerability (AV) and Degree of Vulnerability (...

For high dimensional data, the redundant attributes of samplers will not only increase the complexity of the calculation, but also affect the accuracy of final result. The existing attribute reduction methods are encountering bottleneck problem of timeliness and spatiality. In order to looking for a relatively coarse attributes granularity of problem solving, this paper proposes an efficient at...