BackgroundIn this article, a hybrid photonic crystal fiber has been proposed for chemical sensing. A FEM has been applied for numerical investigation of some propagation characteristics of the PCF at a wider wavelength from 0.7 to 1.7 µm. The geometrical parameters altered to determine the optimized values. The proposed PCF contains three rings of circular holes in the cladding where the core is formulated with microstructure elliptical holes.ResultsThe simulation result reveals that our proposed PCF exhibits high sensitivity and low confinement loss for benzene, ethanol and water than the prior PCFs. We have also shown that our proposed PCF shows high birefringence for benzene 1.544 × 10−3, for ethanol 1.513 × 10−3 and for water 1.474 × 10−3 at λ = 1.33 µm.ConclusionThe proposed PCF is simple with three rings which can be used for the sensing applications of industrially valuable lower indexed chemicals.

Abstract-Collecting network traffic traces from deployed networks is one of the basic steps in understanding communication networks. Traffic traces are used for network management, traffic engineering, packet classification, and analyzing user behavior to ensure adequate quality of service. Monitored traffic traces should be anonymized for privacy and security reasons. The goal of anonymization is to preserve trace properties while enforcing privacy policies. Various tools and techniques have been implemented for trace anonymization. In this paper, we propose and implement an anonymization tool that executes multilevel anonymization and displays analysis results. We describe architecture and features of the tool and discuss analysis of unanonymized and anonymized datasets.

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Web applications or services play an important role in present day to day life. They have impact on the development of both individual and a country. Easy access to services such as online education, banking, reservation, shopping, resources, and information sharing have been proven most efficient for every day life. Various government and private organizations of Bangladesh have started to use web services to support clients. Most of the web applications of Bangladesh is registered with .bd domain and developed using content management system (CMS), various scripting language and SQL or MySQL database. Web applications are popular target for web attackers. However the security issues of the .bd domin web applications are not looked appropriately upon as of yet. One of the most attacked vulnerability of the database driven web applications is SQL injection or SQLi. SQLi through URL and user-input field is extremely high risk in current web based applications. Restricting user access to URL and user input field defies the purpose of web applications. However, the un-restricted user access exposes the vulnerable fields to web attacks. To prevent these exploitation's it is essential to have knowledge of the vulnerabilities adversaries uses to exploit the web applications. This paper presents an evaluation and analysis of SQLi vulnerabilities present in the existing web applications of .bd domain using black box penetration testing approach. User input based SQLi has been used for evaluation.Index Terms -SQLi, web applications, vulnerability, get and post based SQLi.

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