In information security, ignorance is not bliss. It is always stated that hiding the protocols (let the other be ignorant about it) does not increase the security of organizations. However, there are cases that ignorance creates protocols. In this paper, we propose distributed contingency logic, a proper extension of contingency (ignorance) logic. Intuitively, a formula is distributed contingen...

From the emergence of Knowledge Management (KM) systems until today, the vast majority of the implemented systems have concentrated on a centralised architecture, which utilizes knowledge within a single organizational domain. Lately, there is much focus on alternative, distributed approaches, which attempt to overcome the single organization’s KM paradigm, and develop inter-organizational know...

Cloud system is gaining the importance in public environment. But security is always a critical challenge while sharing the valuable information. In this work, a high level integrated security model is presented for managing large data on cloud system. In this work, a RSA integrated SHA method is presented to provide the secure file management in distributed cloud. The proposed authentication a...

Protecting critical infrastructure and targets such as airports, transportation networks, power generation facilities as well as critical natural resources and endangered species is an important task for police and security agencies worldwide. Securing such potential targets using limited resources against intelligent adversaries in the presence of the uncertainty and complexities of the real-w...

registration institution guarantees economic and legal security. human societies always noted this point and created several registration systems. land title registration should be simple, reliable…and well suited to the society it serves. with regard to social conditions, every society fallows from one of these systems. iranian registration system has enough capacity to establish legal securit...