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    SubjectRe: [PATCH] let Net Devices feed Entropy, updated (1/2)
    On 18 Aug 2001 18:41:30 -0500, Oliver Xymoron wrote:
    > Why don't those who aren't worried about whether they _really_ have enough
    > entropy simply use /dev/urandom?

    because there still is no entropy. /dev/urandom and /dev/random are
    from the same source - /dev/random will just block if the entropy count
    drops to 0. note that entropy != bytes in pool. the "entropy" is an
    estimate of the randomness of the pool. it decrements as bytes are
    pulled from the pool. the byte count does not, thus the pool is not
    empty when /dev/random blocks, it just has no "entropy".

    on a diskless/headless system, there are no devices to feed the entropy
    pool. thus this patch, which is a lifesaver for some, as Rik pointed

    or maybe you are like me, and on a personal LAN or dont care about
    external attackers trying to guess your /dev/random, and just want
    another source of entropy to boost your self-esteem.

    i would like to see this in the mainline kernel. i posted a 2.4.8-pre
    patch early, i will rediff for 2.4.9 asap.

    fyi, i am considering rewriting the patch. Alex Bligh and I had a
    discussion where he suggested a sysctl/proc interface to toggle the
    option. this would add post-compile code to the kernel, but allow
    greater flexibility.

    Robert M. Love
    rml at
    rml at

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