What is Sybil Attack in Wireless Networks
/ March 7, 2018

Wireless networking is inherently insecure. Wireless technologies, in the simplest sense, enable one or more devices to communicate without physical connections without requiring network or peripheral cabling. Security in computer world determines the ability of the system to manage, protect and distribute sensitive information. An ever-existing concern is the lack of security due to the very fact that the technology is wireless and is vulnerable to security threats & attacks. Many security mechanisms are based on specific assumptions of identity and are vulnerable to attacks when these assumptions are violated. Overview of Sybil Attack The Sybil attack in computer security is an attack wherein a reputation system is subverted by forging identities in peer-to-peer networks. A Sybil attack is one in which a malicious node on a network illegitimately claims to be several different nodes simultaneously. If an entity on a network does not have physical knowledge of the other entities, it will perceive them purely as informational abstractions called identities. . By illegitimately infusing false or biased information via the pseudonymous identities, an adversary can mislead a system into making decisions benefiting herself The term Sybil attack is to denote an attack where the attacker (Sybil node) tries to…

Understanding of Distributed System
/ December 29, 2017

Networks of computers are everywhere. The Internet is one, as are the many networks of which it is composed. Mobile phone networks, corporate networks, factory networks, campus networks, home networks, in-car networks – all of these, both separately and in combination, share the essential characteristics that make them relevant subjects for study under the heading distributed systems. Distributed computing deals with all forms of computing, information access, and information exchange across multiple processing platforms connected by computer networks. Overview of Distributed System Over the past two decades, advancements in microelectronic technology have resulted in the availability of fast, inexpensive processors, and advancements in communication technology have resulted in the availability of cost effective and highly efficient computer networks. The net result of the advancements in these two technologies is that the price performance ratio has now changed to favor the use of interconnected multiple processors in place of a single, high-speed processor. Distributed systems form a rapidly changing field of computer science. A distributed computer system consists of multiple software components that are on multiple computers, but run as a single system. The computers that are in a distributed system can be physically close together and connected by a local network,…

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