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RC4 No More

31 pointsby singoldalmost 10 years ago

3 comments

beefhashalmost 10 years ago
If I may ask a potentially silly question, does this have any security implications for RC4-based random number generators (notably, FreeBSD arc4random[1] and libbsd arc4random[2]; OpenBSD and NetBSD seem to have replaced their arc4random with a ChaCha-based RNG around 2013)?<p>[1] <a href="https:&#x2F;&#x2F;svnweb.freebsd.org&#x2F;base&#x2F;release&#x2F;10.1.0&#x2F;lib&#x2F;libc&#x2F;gen&#x2F;arc4random.c?revision=274417&amp;view=markup" rel="nofollow">https:&#x2F;&#x2F;svnweb.freebsd.org&#x2F;base&#x2F;release&#x2F;10.1.0&#x2F;lib&#x2F;libc&#x2F;gen&#x2F;...</a><p>[2] <a href="http:&#x2F;&#x2F;cgit.freedesktop.org&#x2F;libbsd&#x2F;tree&#x2F;src&#x2F;arc4random.c" rel="nofollow">http:&#x2F;&#x2F;cgit.freedesktop.org&#x2F;libbsd&#x2F;tree&#x2F;src&#x2F;arc4random.c</a>
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SerpentJoealmost 10 years ago
The page makes use of numeric expressions like 9x2^27. What&#x27;s with the choice of exponent? Why not e.g. 1.125x2^30?
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sctbalmost 10 years ago
Previous discussion: <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=9892157" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=9892157</a>