Cyber threats become more and more pervasive on the Internet and on distributed/decentralized systems. In order to secure communication over these infrastructures and respond to mobility constraint, a new class of Virtual Private Networks (VPN), which support both security and mobility, has emerged in the course of last years. Mobile Virtual Private Networks, called mobile VPN, provide not only...

This paper describes VServ, a prototype architecture for a virtual private network (VPN) service, which builds and manages VPNs on demand. It allows each VPN to have guaranteed resources and customized control, and supports a highly dynamic VPN service where creation and modification operations can take place on fast timescales. These features are contingent on the automated establishment and m...

Information security, sometimes shortened to Info Sec, is the practice of defending information from unauthorized access, use, disclosure, disruption, modification, perusal, inspection, recording or destruction. It is a general term that can be used regardless of the form the data may take (e.g. electronic, physical). Virtual private networks (VPNs) offer low-cost, secure, dynamic access to pri...

Mobile computing systems, service-based systems and some other with mobile interacting components have recently received much attention. However, because of their characteristics such as mobility disconnection, it is difficult to model analyze them by using a structure-fixed model. This work proposes new Petri net called Variable Net (VPN) for modeling analyzing these systems. The definition, f...

VoIP isn’t secure since it uses the Internet to which many people connect simultaneously. In this paper, we designed and implemented a Wireless VoIP + VPN system with which secure telephone calls are possible using the open project SIP VoIP Gateway, 'Asterisk' and 'OpenVPN'. Key-Words: VoIP, VPN, SIP, Wireless, Security, WiFi

The widespread interest in provider-provisioned Virtual Private Network (VPN) solutions lead to memos proposing different and overlapping solutions. The IETF working groups (first Provider Provisioned VPNs and later Layer 2 VPNs and Layer 3 VPNs) have discussed these proposals and documented specifications. This has lead to the development of a partially new set of concepts used to describe the...

Background High protein intake in very preterm neonates (VPN) is important for growth. However, kidneys have fewer functional nephrons and many of the ones present may be immature. Studies shown that high induces nephron hypertrophy, proteinuria, glomerular sclerosis, which lead to tubular injury. Urinary neutrophil gelatinase-associated lipocalin (uNGAL) a biomarker released during proximal ce...