Abstract In today’s era VoIP system is globally accepted and popular communication system because of its reach features. VoIP system uses two signalling protocol: H323 and SIP (Session Initiation Protocol). Out of these SIP is popular amongst VoIP subscriber because of its light weight nature, but SIP is vulnerable to various confidentiality threats because of its text nature and poor authentication. In this... In today’s era VoIP system is globally accepted and popular communication system because of its reach features. VoIP system uses two signalling protocol: H323 and SIP (Session Initiation Protocol). Out of these SIP is popular amongst VoIP subscriber because of its light weight nature, but SIP is vulnerable to various confidentiality threats because of its text nature and poor authentication. In this paper we have attempted to provide confidentiality to SIP signalling message by designing secured symmetric encryption algorithms to address the vulnerability of DES algorithms. Proposed algorithm is working on Feistel cipher principle. Proposed algorithm is tested based on its security strength. Read More Read Less

Abstract Multi-radio Multi-channel (MRMC) Wireless Mesh Networks (WMNs) in recent years have become a preferred choice for end users as they are reliable and extend the network connectivity on the last mile. MRMC-WMNs have already been deployed at various places but still WMN faces link interference issues i.e Information Asymmetry (IA), Near Hidden (NH) and Far Hidden (FH) terminals. These interference issues... Multi-radio Multi-channel (MRMC) Wireless Mesh Networks (WMNs) in recent years have become a preferred choice for end users as they are reliable and extend the network connectivity on the last mile. MRMC-WMNs have already been deployed at various places but still WMN faces link interference issues i.e Information Asymmetry (IA), Near Hidden (NH) and Far Hidden (FH) terminals. These interference issues have made the capacity of MRMC-WMNs limited. To maximize the MRMCWMN capacity in this paper we are presenting an algebraic channel assignment model that minimizes information asymmetry (IA) interference. Our proposed model optimally assigns IEEE 802.11b/g non-overlapping channels (1,6 and 11) to various links of MRMC-WMN. For extensive simulations we consider various MRMC-WMN topologies. We compare the results of both the scenarios where our algebraic optimization model has been applied with those where the model has not been applied. Simulation results show that our proposed optimization model maximizes the capacity of MRMC-WMN up to 8%. Read More Read Less

Abstract Security risks exist in fireworks production and storage and there have been many accidents in the past few years. The introduction of chain management for fireworks industry is currently a new exploration and it is the new development trend of this industry. Using environmental monitoring system and the indoor positioning and tracking system based on RFID technology for real-timely monitoring the... Security risks exist in fireworks production and storage and there have been many accidents in the past few years. The introduction of chain management for fireworks industry is currently a new exploration and it is the new development trend of this industry. Using environmental monitoring system and the indoor positioning and tracking system based on RFID technology for real-timely monitoring the people walking paths and production environment, the processes among production and storage would be safer and easily avoid accidents. At the same time, it can improve the management style and increase the profits of enterprises, for improving the quality of products and reducing the administration cost. Read More Read Less