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Thread: Anyone worked on RC4 ?

  1. #1

    Anyone worked on RC4 ?

    Hey all,

    has anyone on this board given a look to RC4 ? Anyone had any ideas
    or successes with it ?

    Cheers,
    Halvar

  2. #2
    הבּרוּ נשׂאי כּלי יהוה mike's Avatar
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    Mar 2001
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    491
    What do you mean? It's a stream cipher with some pretty-well understood attacks, but if you avoid those, it's still secure.

    http://www.ipa.go.jp/security/enc/CRYPTREC/fy15/doc/1043_IPA-RC4_%20report_final.pdf

  3. #3
    What I mean is what I wrote: Has anyone on this board spent time
    attacking RC4 ? There has been a lot of (fairly serious) discussion of
    MD5-like schemes on the board recently, and I have spent some time
    on it (while I made no progress on the full version, I did end up learning
    a lot about solving narrow T-functions as in the puzzle I posted, and I
    understand now why the bit rotations are absolutely crucial to MD4/MD5).
    From this I assumed that other people on this board might have tried
    to deal with RC4 -- it's one of the simpler ciphers (in design), and due
    to it's boardgame-like characteristics and simplicity I am just curious if
    somebody has tried banging his head against it, and if they've come up
    with anything funny/interesting on their way there.

    Cheers,
    Halvar

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