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Can someone please explain the C&C for bots ? im reading a paper about Android bot , and its explaining something called URL flux as method of C&C . however i couldn't really get it , so i need to know how normal bots preform c&c so i can understand this . for example why the bot needs a public key to authenticate commands ? and what the username generator algorithm for ?

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You have two questions in there, and these are well documented in various places, but let me have a quick stab at it:

  • you don't want your bot taking commands from the wrong place, so you need an authentication mechanism. Public/Private key pairs provide an easy, scalable mechanism

  • it helps to be able to keep unique id's for all bots so you can address them or seems specific commands

Traditionally the C&C had been the weakest point as if it was taken out the botnet would fail, so improvements included using a selection of URLs, and URLFlux takes that a step further.

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Fastflux is a technique in which DNS records are change constantly for a given C&C server. With botnet C&C server have a DNS name rather then the IP address, if anyone of the C&C server is taken down it can be immediately move down to different IP address. So this technique practically makes impossible to take down a complete botnet.

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