The role of network and information systems is increasing in our day today infrastructures that provide critical services like banking and commerce applications, telecommunications, distribution, transportation, etc. This increases the levels of dependability on such applications, which brings about several pros and cons as well. If these infrastructures are damaged, it can compromise the availability of the critical services. Thus, it is the need of the hour to secure the available network and information systems from malicious attacks. In this paper, we have proposed a secure technique named as Network Liability Detection (NLD) and a software we named as Network Liability Tool (NLT), that points out the liabilities or vulnerabilities of your system that can be exploited to compromise its security. We propose a model based approach where the behavior of each component of the system is carefully monitored to find out the well known as well as as-yet-unknown loopholes in the system. A prototype of the application is built in Windows Platform using Java, to demonstrate the entire functioning of this system and helps in solving the security related loopholes in the network servers. The speculative results affirm that the proposed technique is effective in detecting the liabilities of the network servers.

Security is the major part of home automation systems for the people. With the development of network and automatic control technology, a home security monitoring and alarming system becomes more and more practicable today. In this paper we have proposed simple, low cost, low power consumption and a novel method for implementing the home security using Zigbee (802.15.4) standard and also a security protocol for detecting and localizing identity based attacks in the system. We have named our scheme as Wireless Home Security System (WHSS) and protocol as Wireless Home Security Protocol (WHSP). It consists of many sensor nodes deployed in the rooms as well as the doors/ windows of the house together with the zigbee modules which act as end devices that monitor continuously and send the security status of each room to the coordinator node connected to a PC which acts as the master. The communication in this case is multi-hop which provides unlimited range. Here we have used the XBEE Pro series1 (XBP24-AWI-001) radios for RF communication, DYP-ME003 PIR sensor, and Contact Door / window sensor based on magnetic reed switch (ORD221).The hardware implementation has been tested for validation successfully. The software has been implemented using C#. Also the performance of our proposed security protocol has been analysed using NS2 and is found to be satisfactory.