Wireless networks are increasingly used for a wide range of applications, includ

Question

Wireless networks are increasingly used for a wide range of applications, including social networking, environment monitoring, banking and other financial transactions. The benefits of mobile wireless communication freeing people from hard connections to a fixture are realized by having all signals fill up the space. The receiving devices are responsible to retrieve the information from the signals which are available to any devices in nearby space. Thus, security is an important issue in wireless communication system. Traditionally security is implemented at logical layers of communication networks, such as data encryption. The computation overhead is tolerable for most traditional system due to the advancement of computing power. However, in some emerging wireless networking architectures, issues of key management or computational limitation make the use of data encryption difficult or even non-realistic. Examples include ad hoc networks, sensor networks, radio-frequency identification RFID), T enhance security in traditional and emerging wireless networks, physical layer security has become a major research topic recently. Leveraging the properties of wireless signal propagation, a properly designed system can inhibit the ability of potential eavesdroppers to gain information on confidential messages. The mechanism includes the exploration of noise, fading, interference and path diversity with multiple antennas. In most wireless channels, the wireless signal propagates in all directions. For the communication between transmitter and receiver an Eavesdropper, Eve, can receive the signals from both transmitter and receiver as far as the Eavesdropper is in the range defined by the transmitting power. Maximizing the secrecy capacity or implementing perfect secrecy is the goal of physical layer security. Channel noise plays an important role in physical layer security since the noise reduces channel information in different way for different channels. Proper noise level can increase the secrecy capacity Explain what are some factors that might hinder/limit the eavesdropper from capturing the private communications? rv Alice Bob HE Eve

Explanation / Answer

ANSWER:-

Data confidentiality:     The security mechanism should ensure that no message in the network is understood by anyone except intended recipient.

(iii)public information such as sensor identities, and public keys of the nodes should alsobe encrypted in certain cases to protect against traffic analysis attacks.

Data integrity:     The mechanism should ensure that no message can be altered by an entity as it               traverses from the sender to the recipient.

Electronic noise:        IT staff mainly deals with electronic noise, created in the radio or network systems           that transmit data, or in the medium -- such as wire and air -- through which signals are transmitted.

Thermal Noise:          Thermal noise occurs in all transmission media and communication equipment, including passive devices.

InterModulation Noise:        Intermodulation (IM) effects result when two or more signals pass through a nonlinear device or medium and interact with each other in ways that produce additional signals, such as harmonics and subharmonics of input signal frequencies.

Cross talk:           Cross-talk refers to signals interfering with each other electromagnetically.

Impulse noise:      Impulse noise is a noncontinuous series of irregular pulses or noise spikes of short duration, broad spectral density and of relatively high amplitude.

Shot Noise:          Shot noise, also called quantum noise, is the variation in a signal that is caused by the quantized nature of the light and electricity making up the signal.

Transit time noise:       Transit-time noise is a similar phenomenon to shot noise in that it affects systems          more as they get smaller due to the quantized nature of electricity.

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