Abstract In this paper we express a new intrusion detection system based FSM (Finite State Machine) in ad hoc networks. Security is one of the most important issues in current networks. The most common cases of attacks in mobile Ad hoc networks can be drop of routing packages and changes in the incoming packet which aims at disrupting the network routing... In this paper we express a new intrusion detection system based FSM (Finite State Machine) in ad hoc networks. Security is one of the most important issues in current networks. The most common cases of attacks in mobile Ad hoc networks can be drop of routing packages and changes in the incoming packet which aims at disrupting the network routing and overall network reduce performance. The presented approach based on FSM focuses at recognizing the malicious nodes within the network in a fast and accurate way, then it deals with rapid introduction of the malicious nodes to other nodes in the network to prevent sending multiple packets and drop and packet change. Finally, we will show the significant improvement of some factors in comparison with other last works and we simulated our methods by NS2 software. Read More Read Less

Abstract This paper presents a novel group signature scheme based on the discrete logarithm problem. In this scheme the length of the signature is independent of the number of members of the group and it supports message recovery feature. In case, some members left the group or joins the group, the group signature remains valid. All valid signatures are traceable by... This paper presents a novel group signature scheme based on the discrete logarithm problem. In this scheme the length of the signature is independent of the number of members of the group and it supports message recovery feature. In case, some members left the group or joins the group, the group signature remains valid. All valid signatures are traceable by only the group manager. Every member of the group has a pair of secret keys: one is generated by the member himself and the other is provided by the group manager. Neither the group manager nor any group members can produce a valid signature on behalf of a member. The proposed scheme provides signer’s anonymity, i.e., the verifier can verify the group signature by knowing only the group’s public information. This scheme has wide applications in real life scenarios, such as, e-cash, eauction, press releases and secures electronic transactions. Read More Read Less

Abstract Social networking sites have experienced a steady and dramatic increase in the number of users over the past several years. Thousands of user accounts, each including a significant amount of private data, are created daily. As such, an almost countless amount of sensitive and private information is read and shared across the various accounts. This jeopardizes the privacy and safety... Social networking sites have experienced a steady and dramatic increase in the number of users over the past several years. Thousands of user accounts, each including a significant amount of private data, are created daily. As such, an almost countless amount of sensitive and private information is read and shared across the various accounts. This jeopardizes the privacy and safety of many social network users and mandates the need to increase the users’ awareness about the potential hazards they are exposed to on these sites. We introduce Protect_ U, a privacy protection system for Facebook users. Protect_ U analyzes the content of user profiles and ranks them according to four risk levels: Low Risk, Medium Risk, Risky and Critical. The system then suggests personalized recommendations designed to allow users to increase the safety of their accounts. In order to achieve this, Protect_ U draws upon both the local and community-based protection models. The first model uses a Face book user’s personal data in order to suggest recommendations, and the second seeks out the user’s most trustworthy friends to encourage them to help improve the safety of his/her account. Read More Read Less

Abstract Information systems are more and more opened on Internet today. This opening, a prior beneficial, nevertheless raises a major problem: it ensues from it an increasing number of attacks. The IDS was developed with the aim of detecting abnormal functioning of information systems and networks, indicating that actions not corresponding to the safety policy are led by one or several... Information systems are more and more opened on Internet today. This opening, a prior beneficial, nevertheless raises a major problem: it ensues from it an increasing number of attacks. The IDS was developed with the aim of detecting abnormal functioning of information systems and networks, indicating that actions not corresponding to the safety policy are led by one or several users. Centralized IDS suffer from significant limitations when used in high speed networks, especially when they face distributed attacks. In this paper we propose a distributed hybrid approach based on mobile agents for the detection of intrusion: HAMA-IDS (Hybrid Approach based on Mobile Agents for Intrusion Detection System). The proposed approach uses the platform Aglets for the creation and the distribution of four types of mobile agents. The Collector agent is used to the gathering of information, when the Analyzer and Redirector agent are responsible of the analysis (scenarios and behavioral analysis). The generator agent is responsible to the launch of these agents and to the management of messages received from these last ones. Read More Read Less