Hierarchies arise in the context of access control whenever the user population can be
modeled as a set of partially ordered classes (represented as a directed graph). A user with …

Providing secure and efficient access to large scale outsourced data is an important
component of cloud computing. In this paper, we propose a mechanism to solve this …

A key assignment scheme is a cryptographic technique for implementing an information flow
policy, sometimes known as hierarchical access control. All the research to date on key …

A hierarchical key assignment scheme is a method to assign some private information and
encryption keys to a set of classes in a partially ordered hierarchy, in such a way that the …

The access privileges in distributed systems can be effectively organized as a hierarchical
tree that consists of distinct classes. A hierarchical time-bound key assignment scheme is to …

This study introduces a hierarchical key assignment scheme (HKAS) based on the closest
vector problem in an inner product space (CVP-IPS). The proposed scheme offers a …

Conventional hierarchical key assignment schemes have not been concerned with a
practical situation: Users might be assigned to a class for only a period of time. When a user …

The access privileges in many distributed systems can be effectively organized as a
hierarchical tree. Distributing distinct cryptographic keys to distinct entities, according to their …

A method for managing shared passwords on a multi-user computer system is disclosed. A
set of shared passwords and an administrator internal key are initially generated. After the …

Access hierarchies are useful in many applications and are modeled as a set of access
classes organized by a partial order. A user who obtains access to a class in such a …