For portable communication systems, the delegation-based authentication protocol provides efficient subsequent login authentication, data confidentiality, user privacy protection, and non-repudiation. However, in all proposed protocols, the non-repudiation of mobile users is based on an unreasonable assumption that home location registers are always trusted. To weaken this assumption and enhanc...

This paper develops a framework for wireless security that provides confidentiality, identity authentication, message authentication, integrity, sender non-repudiation, receiver non-repudiation and anonymity. Our framework is based on two physical primitives: collaborative jamming and spatial signature enforcement. Notably, it eschews the use of shared secrets, while providing a cryptosystem th...

The lack of security obstructs a large scale deployment of the multicast communication model. Therefore, a host of research works have been achieved in order to deal with several issues relating to securing the multicast, such as confidentiality, authentication, non-repudiation, integrity and access control. Many applications require authenticating the source of the received traffic, such as br...

The wireless communication with delivering variety of services to users is growing rapidly in recent years. The third generation of cellular networks (3G), and local wireless networks (WLAN) are the two widely used technologies in wireless networks. 3G networks have the capability of covering a vast area; while, WLAN networks provide higher transmission rates with less coverage. Since the two n...

In Vehicular Ad-hoc networks are networks of communication between vehicles and roadside units and inter vehicle units. It can be used to provide traffic management, route planning, and identifying roadside units using short-range wireless communication. This network has the potential to increase safety system and it can provide many services to drivers, but they also present risks to privacy a...

Digital signatures provide authentication and non-repudiation in a public way in the sense that anyone can verify the validity of a digital signature using the corresponding public key. In this paper, we consider the issues of (1) signature privacy and (2) the corresponding public provability of signature. We propose a new digital signature variant, secret signature, which provides authenticati...

Any web security system should achieve three conceptual goals are; confidentiality, integrity and Non-repudiation, and authentication. Also any system of communication when it is designed with these security services are taken into account and these security services must be defined and can be shortened format as (CIA).In this paper, we are going to discuss the theoretical background on the obj...

Recently, Park and Lee [6] proposed the nominative proxy signature scheme for mobile communication. In [6], they argued that their scheme satisfies the following security requirements: user anonymity, authentication and non-repudiation. However, in this paper, we show that their scheme does not satisfy the non-repudiation among their security requirements. And then we propose a new nominative p...

Vehicular ad hoc networks (VANETs) are the specific class of Mobile ad hoc networks (MANETs).In a VANET, vehicles will rely on the integrity of received data for deciding when to present alerts to drivers. In this paper, we investigate the authentication issues with privacy preservation and non-repudiation in VANETs. We propose a novel framework with preservationand repudiation (ACPN) for VANET...