Delegation is a powerful mechanism to provide flexible and dynamic access control decisions. Delegation is particularly useful in federated environments where multiple systems, with their own security autonomy, are connected under one common federation. Although many delegation schemes have been studied, current models do not seriously take into account the issue of delegation commitment of the...

belief in the lofty positions and excellences of the shi’īte imams (a.s.) and having faith in their miraculous acts and dominion over the world affairs underlies the authentic doctrine of unconditional guardianship (wilāya al-takwīnī). when the imams’ devotees try to maintain a demigod status for the imams in line with this – possibly loving and devotional – belief beyond the conventional limit...

In this paper we propose an accountability management framework for resource sharing in peer-to-peer (P2P) distributed computing systems. On the basis of a generalized e-coin paradigm, we developed the management framework based on the distribution of resource credit/policy, exchange of service and service evidences, and accountability management. A tree topology is assumed for the distribution...

My purpose in writing this piece is to reflect upon a series of conversations in which I participated on the subject of empowerment over the past year. I believe that empowerment is key to innovation. For me, the essential aspect of the paper is my personal attempt to sort out why it is that employers, service providers and governments say they want to but do not reliably create empowerment in ...

Introduction One of the keys to successful management is the ability to understand and apply modern management principles and techniques effectively. Managers must develop an in-depth knowledge of past and present models, theories and processes in order to manage effectively and intelligently. Contemporary management practice is pervasive in every aspect of human life within all types of organi...

Abstract To investigate delegation decisions within organizations, we develop a principal-agent model in which the principal can only informally delegate authority to agent and parties openly disagree with each other sense of differing prior beliefs about optimal course action. Our analysis shows that degree disagreement determines what kind policy commit this, turn, alters agent’s effort for i...

Information systems are organisations in which signs are created, processed and consumed for social and economic purposes. In order to fulfil the organisational goals and objectives, members within an organisation must understand their responsibilities and authorities, and must act cooperatively. The key to this organisation and coordination lies in norms which define responsibilities and autho...

In this paper we present PAMINA (Privilege Administration and Management INfrAstructure), a privilege management system using authorization certificates. Our system supports distributed environments where autonomous authorities can manage and delegate privileges in accordance with their own policies. We introduce Improved Certification Verification Trees (I-CVTs) that guarantee very efficient a...

Aim The aim of this research was to explore how newly qualified nurses learn to organise, delegate and supervise care in hospital wards when working with and supervising healthcare assistants. It was part of a wider UK research project to explore how newly qualified nurses recontextualise the knowledge they have gained during their pre-registration nurse education programmes for use in clinical...

Recent advances in encryption schemes have allowed us to go far beyond point to point encryption, the scenario typically envisioned in public key encryption. In particular, Functional Encryption (FE) allows an authority to provide users with keys corresponding to various functions, such that a user with a secret key corresponding to a function f , can compute f(m) (and only that) from a cipher-...