17-12-2012, 06:48 PM
SECURITY ISSUES IN WIRELESS SENSOR NETWORK
1SECURITY ISSUES.ppt (Size: 355.5 KB / Downloads: 40)
INTRODUCTION
What is Wireless Sensor Network?
A wireless sensor network (WSN) consists of distributed autonomous sensors to closely monitor physical or environmental conditions( such as temperature, sound, vibration, pressure, motion or pollutants). The applications supported by WSNs vary from monitoring, tracking to controlling.
Cryptography
The encryption-decryption techniques devised for the traditional wired networks are not feasible to be applied directly for the wireless networks and in particular for wireless sensor networks .
Applying the security mechanisms such as encryption could also increase delay, jitter and packet loss in wireless sensor networks
Steganography
Steganography aims at hiding the existence of the message.
Steganography is the art of covert communication by embedding a message into the multimedia data (image, sound, video, etc.).
Physical layer Secure Access
Physical layer secure access in wireless sensor networks could be provided by using frequency hopping.
Important points in physical layer secure access are the efficient design so that the hopping sequence is modified in less time than is required to discover it and for employing this both the sender and receiver should maintain a synchronized clock.
Danial of Service
Denial of Service (DoS) is produced by the unintentional failure of nodes or malicious action.
The simplest DoS attack tries to exhaust the resources available to the victim node, by sending extra unnecessary packets and thus prevents legitimate network users from accessing services or resources to which they are entitled
Conclusion
Most of the attacks against security in wireless sensor networks are caused by the insertion of false information by the compromised nodes within the network.
Many of today’s proposed security schemes are based on specific network models.
Even if holistic security could be ensured for wireless sensor networks, the cost-effectiveness and energy efficiency to employ such mechanisms