Web robots are software programs which automatically traverse through hyperlink structure of Web to retrieve Web resources. Robots can be used for variety of tasks such as crawling and indexing information for search engines, offline browsing, shopping comparison and email collectors. Apart from that robots can also be used for some malicious purposes like sending ...

Message authentication is one of the most effective ways to thwart unauthorized and corrupted messages from being forwarded in wireless networks. For this reason, many message authentication schemes have been developed, based on either symmetric-key cryptosystems or public key cryptosystems. Most of them, however, have the limitations of high computational and communication overhead in addition ...

Recently large numbers of applications are developed in wireless sensor networks with more numbers of portable sensor nodes to increase the quality of service of such applications. The failure occurred in sensor nodes typically affects the quality of service of Wireless Sensor Networks (WSNs). This algorithm is a combination of discrete round trip delay & ...

Clustering is an effective and practical way to enhance the system performance of Wireless Sensor Networks (WSNs). In WSNs, it is highly a difficult task to achieve secure data transmission. In existing system, some of the protocols such as SecLEACH, GS-LEACH and RLEACH were used, but orphan node problem exists. Thus by using these protocols, ...

WiMAX means Worldwide interoperability for Microwave Access. It is the wireless technology and enhancement of 802.16 standards. The forum describes WiMAX as “A standards-based technology enabling the delivery of last mile wireless broadband access as an alternative to cable and DSL”. WiMAX has many salient advantages such as: high data rates, quality of service, scalability, ...

The big data has become a popular topic because of enormous growth in the field of information technology. The distributed sensor network is the production of big data. A single sensor in a network may not give a significant data, but the data sensed by millions of sensors produce a big data. Big data gathering ...

Wireless Sensor Networks (WSNs) are mainly powered by batteries. Due to limited energy storage capacity of a sensor battery, WSNs can usually remain operational only for a limited amount of time. To overcome this drawback joint mobile energy replenishment and data gathering is introduced. In the existing Joint Mobile energy Replenishment and Data Gathering (JMRDG) ...

Image processing field is becoming more popular for the security purpose in now-a-days. It has many sub fields and face recognition is one from them. Many techniques have been developed for the face recognition but in this paper, the authors just discussed two prevalent techniques PCA (Principal Component Analysis) and LDA (Linear Discriminant Analysis) and ...