Arcfour256 safety in SSH

Posted on 2011-10-26
Last Modified: 2013-11-16
I read several contrasting analysis on the alleged safety of the Arcfour256 cipher. I'd like to use it in SSH because it's the fastest cipher, but is it actually so easy to break?

Question by:jiiins2
    LVL 63

    Expert Comment

    Why is fast so important to you ?

    I would stick with the standards rather than doing with one that even has a slim chance of being broken.

    Also I would test to see if you can notice any difference in speed.

    I hope this helps !

    Author Comment

    Thanks. Fast is important because I need to tunnel a lot of web traffic... Any ideas on my question?
    LVL 22

    Accepted Solution

    No, it is not very easy to crack. Most of the problems that have existed with ARCFOUR256 have to do with *how* it is used, not due to its inherent weakness. That said, there are attacks and you should avoid it for new applications. How worried are you about someone attacking your session? Government/NSA worried? Or Casual/Script Kiddie worried?

    Author Comment

    I'd say casual worried... Is there anything particular I should or shouldn't do when using it with ssh to make tunnels?
    LVL 22

    Assisted Solution

    You should be okay. If you are tunneling, I would try to re-create the tunnels periodically. The longer it exists, the longer an attacker has to figure out the key.

    Author Closing Comment


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