Diameter Protocol Research Articles

Research into unified authentication system of digital campus

Campus authentication system is a key part of digital campus.After analyzing the demands of authentication system,a campus unified authentication system based on IEEE 802.1X protocol and Diameter protocol was proposed.By extending EAP-PEAP protocol and introducing message routing mechanism in Diameter protocol,this authentication system can provide cross-domain authentication and authentication ticket distribution,thus solving the roaming authentication and single sing-on problems in campus network authentication system.At last,some means of attack were analyzed,and corresponding solutions were proposed.

Effects of halogen light irradiation variables (tip diameter, irradiance, irradiation protocol) on flexural strength properties of resin-based composites

Objective Investigation of halogen light irradiation variables (tip diameter, irradiance, irradiation protocol) on flexural strength and modulus of four methacrylate resin-based composites (RBCs). Methods Rectangular bar-shaped specimens (25 mm × 2 mm × 2 mm; n = 20 per group) of four RBCs were irradiated at varying irradiances (640 and 790 mW/cm 2; standard and boosted mode) with different tip diameters (8, 11, 13 and 25 mm) and for the 8 mm Turbo light tip diameter at irradiances of 880 and 1040 mW/cm 2 (standard and boosted mode). Following irradiation the specimens were stored in a light-proof container for 24 h at 37 ± 1 °C and tested in three-point flexure. One-way analyses of variance were made at P = 0.05, guided as necessary by Tukey's correction in multiple partial analyses, in addition to a Weibull analysis. Results The mean three-point flexure strengths, Weibull moduli and flexure moduli of the four RBC materials, irradiated with varying irradiances, tip diameters and irradiation protocols highlighted no significant differences although the values were material specific. Similarly the 8 mm conventional and Turbo tip diameter resulted in no significant differences for varying irradiances and irradiation protocols. Conclusion Within the limitations of the experiment halogen tip diameter, irradiance and irradiation protocol have no influence on three-point flexural strength and modulus data. The efficacy of the overlapping irradiation regime was upheld for the conditions tested.

An XML-based testing strategy for probing security vulnerabilities in the diameter protocol

Buffer overflows and format string attacks are always at the fingertips of hackers. This poses a threat to every application running over an Internet Protocol (IP) network—from Web servers in the Internet to the session managers in charge of the call session control function (CSCF) in the IP Multimedia Subsystem (IMS) network. As bugs persist in most software development practices, it is critical to perform thorough security testing before the product is finally deployed. This paper proposes an extensible markup language–(XML)-based testing strategy to detect vulnerabilities and verify robustness to buffer overflow and format string attacks in the implementation of the Diameter protocol, which plays a vital role in IMS billing and subscriber database interfaces. The paper introduces a test generation strategy built upon the XML Schema language's flexibility in data description. It differs from the traditional finite state machine–(FSM)-based syntax testing strategy in the test description, organization, and automation aspects. The proposed strategy is then applied to Alcatel-Lucent Control Platform (A-LCP) Diameter stack security verification by integrating two open source tools—Seagull and xmlgen. The result supports our continuous effort to identify software security vulnerabilities. © 2007 Alcatel-Lucent.

An XML-based testing strategy for probing security vulnerabilities in the diameter protocol

Buffer overflows and format string attacks are always at the fingertips of hackers. This poses a threat to every application running over an Internet Protocol (IP) networkfrom Web servers in the In...

Design and implementation of an integrated accounting architecture for distributed UMTS and WLAN networks

Accounting for resource and service usage in communication networks forms the basis of network operators' business, and is therefore essential. Within a heterogeneous, multidomain mobile environment of emerging new access technologies, the demand for a distributed accounting infrastructure becomes more relevant. Driven by the analysis of current accounting solutions in Universal Mobile Telecommunications System (UMTS) and Wireless Local Area Networks (WLAN) networks, the newly developed approach presents an integrated accounting architecture based on the Diameter protocol, forming a flexible basis for charging UMTS and WLAN communication services. The system developed is described, discussed and evaluated by a prototypical implementation.

Providing AAA services in IPv6 networks

AAA (Authentication, Authorisation, and Accounting) frameworks are defined as a set of models, infrastructures, and protocols needed to interconnect AAA entities. They have been mainly deployed so far using the RADIUS protocol in IPv4 networks. However, when taking such AAA systems to IPv6 networks some interesting issues appear that need to be addressed. This is the main focus of this paper where both RADIUS and Diameter protocols are deployed in different IPv6-related scenarios after a deep analysis.

Inter-domain security for mobile IPv6

Mobile IPv6 is only adapted to the mobile’s movements within its own administrative domain. As Mobile IPv6 is expected to be the basis for beyond 3G networks, a solution for inter-domain security is required allowing the visited domain to authenticate any mobile to grant it access. As such, new concepts known as AAA for Authentication, Authorization, Accounting were defined by the IETF. The IETF is currently defining the Diametr protocol to support those three functions in a Mobile IPv4 environment. Today’s difficulty is to adapt the Diameter protocol to Mobile IPv6. After introducing the Mobile IPv6, IPsec and Diameter protocols, this paper presents our solution (IETF draft of December 2001), and an IETF alternative for adapting Diameter to Mobile IPv6. It gives a comparison and describes our prototype.