Berkeley CSUA MOTD:Entry 24543
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2025/05/24 [General] UID:1000 Activity:popular
5/24    

2002/4/23-24 [Computer/SW/Security] UID:24543 Activity:very high
4/23    Security question: assuming i have a "good" /dev/random and I
        read from /dev/random from 00:00 to 00:01 and save that in a file,
        will take make it trivial to attack someome who uses /dev/random on
        the same machine to "seed" a random passwd generator at 00:00:30?
        Or does each caller some how whiten it with his own environment?
        \_ Or say I read in 10k bytes from /dev/random or /dev/urandom
           at 00:00 and I start and another copy of the same process "at
           the same time", will I get overlapping random streams?
           at 00:00, which takes 2 seconds.  I start and another copy of
           the same process a couple of millisenconds after 00:00,
           will I get overlapping or interleaved random streams?
         \_ no and no, if it is a "good" /dev/random
            \_ So what prevents two people "simultaneously" reading from
               /dev/random from letting the same stream?
               \_ The driver probably has a locking mechanism in the
                  read entry point to prevent this:
                  ep_read { lock ; copy bit to userspace ; unlock ; }
2025/05/24 [General] UID:1000 Activity:popular
5/24    

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