Thesis Wireless Security

Thesis Wireless Security-5
In wireless ad hoc networks, since all nodes share the common communication medium, attackers can easily launch a variety of attacks ranging from passive eavesdropping from active interfering.

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By creating a wormhole or apply- ing rushing attacks, the attackers can prevent good routes from being discovered, and increase their chance of being on discovered routes.

Once an attacker is on a certain route, it can create a black hole by dropping all the packets passing through it, or create a gray hole by selectively dropping some packets passing through it.

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This can be achieved by applying necessary access con- trol and authentication , such as secure key distribution and secure neighbor discovery , etc.

For example, Zhou and Haas investigated distributed certi¯cate authorities in ad hoc networks using threshold cryptogra- phy [0]. developed the idea of self-organized public-key infras- tructure similar to PGP in the sense that public-key certi¯cates are issued by the users [,].

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Some examples of routing attacks are: black hole, 9gray hole, wormhole, rushing attack, and frame-up [{7].

For example, the at- tackers can create a wormhole through collusion in the network to short circuit the normal °ow of routing packets [5], or can apply rushing attack to disseminate route request quickly through the network [6].


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