218,814 research outputs found
Attribute-based group key establishment
Motivated by the problem of establishing a session key among
parties based on the possession of certain credentials only, we discuss a
notion of attribute-based key establishment. A number of new issues arise
in this setting that are not present in the usual settings of group key
establishment where unique user identities are assumed to be publicly
available.
After detailing the security model, we give a two-round solution in the
random oracle model. As main technical tool we introduce a notion of
attribute-based signcryption, which may be of independent interest. We
show that the type of signcryption needed can be realized through the
encrypt-then-sign paradigm. Further, we discuss additional guarantees
of the proposed protocol, that can be interpreted in terms of deniability
and privacy
Single sign-on and authorization for dynamic virtual organizations
The vision of the Grid is to support the dynamic establishment and subsequent management of virtual organizations (VO). To achieve this presents many challenges for the Grid community with perhaps the greatest one being security. Whilst Public Key Infrastructures (PKI) provide a form of single sign-on through recognition of trusted certification authorities, they have numerous limitations. The Internet2 Shibboleth architecture and protocols provide an enabling technology overcoming some of the issues with PKIs however Shibboleth too suffers from various limitations that make its application for dynamic VO establishment and management difficult. In this paper we explore the limitations of PKIs and Shibboleth and present an infrastructure that incorporates single sign-on with advanced authorization of federated security infrastructures and yet is seamless and targeted to the needs of end users. We explore this infrastructure through an educational case study at the National e-Science Centre (NeSC) at the University of Glasgow and Edinburgh
HiTrust: building cross-organizational trust relationship based on a hybrid negotiation tree
Small-world phenomena have been observed in existing peer-to-peer (P2P) networks which has proved useful in the design of P2P file-sharing systems. Most studies of constructing small world behaviours on P2P are based on the concept of clustering peer nodes into groups, communities, or clusters. However, managing additional multilayer topology increases maintenance overhead, especially in highly dynamic environments. In this paper, we present Social-like P2P systems (Social-P2Ps) for object discovery by self-managing P2P topology with human tactics in social networks. In Social-P2Ps, queries are routed intelligently even with limited cached knowledge and node connections. Unlike community-based P2P file-sharing systems, we do not intend to create and maintain peer groups or communities consciously. In contrast, each node connects to other peer nodes with the same interests spontaneously by the result of daily searches
DyVOSE project: experiences in applying privilege management infrastructures
Privilege Management Infrastructures (PMI) are emerging as a necessary alternative to authorization through Access Control Lists (ACL) as the need for finer grained security on the Grid increases in numerous domains. The 2-year JISC funded DyVOSE Project has investigated applying PMIs within an e-Science education context. This has involved establishing a Grid Computing module as part of Glasgow University’s Advanced MSc degree in Computing Science. A laboratory infrastructure was built for the students realising a PMI with the PERMIS software, to protect Grid Services they created. The first year of the course centered on building a static PMI at Glasgow. The second year extended this to allow dynamic attribute delegation between Glasgow and Edinburgh to support dynamic establishment of fine grained authorization based virtual organizations across multiple institutions. This dynamic delegation was implemented using the DIS (Delegation Issuing) Web Service supplied by the University of Kent. This paper describes the experiences and lessons learned from setting up and applying the advanced Grid authorization infrastructure within the Grid Computing course, focusing primarily on the second year and the dynamic virtual organisation setup between Glasgow and Edinburgh
Proceedings from the Synthetic LBD International Seminar
On May 9, 2017, we hosted a seminar to discuss the conditions necessary to im- plement the SynLBD approach with interested parties, with the goal of providing a straightforward toolkit to implement the same procedure on other data. The proceed- ings summarize the discussions during the workshop
An Elliptic Curve-based Signcryption Scheme with Forward Secrecy
An elliptic curve-based signcryption scheme is introduced in this paper that
effectively combines the functionalities of digital signature and encryption,
and decreases the computational costs and communication overheads in comparison
with the traditional signature-then-encryption schemes. It simultaneously
provides the attributes of message confidentiality, authentication, integrity,
unforgeability, non-repudiation, public verifiability, and forward secrecy of
message confidentiality. Since it is based on elliptic curves and can use any
fast and secure symmetric algorithm for encrypting messages, it has great
advantages to be used for security establishments in store-and-forward
applications and when dealing with resource-constrained devices.Comment: 13 Pages, 5 Figures, 2 Table
Trust Evaluation for Embedded Systems Security research challenges identified from an incident network scenario
This paper is about trust establishment and trust
evaluations techniques. A short background about trust, trusted
computing and security in embedded systems is given. An analysis
has been done of an incident network scenario with roaming
users and a set of basic security needs has been identified.
These needs have been used to derive security requirements for devices and systems, supporting the considered scenario. Using the requirements, a list of major security challenges for future research regarding trust establishment in dynamic networks have been collected and elaboration on some different approaches for future research has been done.This work was supported by the Knowledge foundation and RISE within the ARIES project
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