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jedisct1's profile
Frank
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Frank
@jedisct1

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Frank

@jedisct1

France
Joined November 2008

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    1. Robᵉʳᵗ Graham 😷‏ @ErrataRob 4 Jun 2019
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      The tradeoff is that sometimes you need TRUE randomness, which is created from random events that happen in hardware. Right after systems boot, and especially in VMs distant from the hardware, enough true randomness (entropy) doesn't exist yet.

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    2. Robᵉʳᵗ Graham 😷‏ @ErrataRob 4 Jun 2019
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      So what should your software do, continue running with whatever randomness it can get? or wait, often indefinitely, from enough randomness to happen before continuing?

      1 reply 0 retweets 3 likes
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    3. Robᵉʳᵗ Graham 😷‏ @ErrataRob 4 Jun 2019
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      The general solution, when you look in crypto libraries like OpenSSL, is to read from /dev/urandom AND gather some of your own entropy to "mix" in. Because crypto, we can endlessly mix extra data in and it'll never make it worse.

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    4. Robᵉʳᵗ Graham 😷‏ @ErrataRob 4 Jun 2019
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      FYI: /dev/urandom gets you the best randomness the operating system can give you without blocking, which is 99.99% of the time good enough, except on boot. /dev/random blocks, possibly indefinitely, until it can give you the number of truly random bits you asked for.

      3 replies 3 retweets 7 likes
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    5. Robᵉʳᵗ Graham 😷‏ @ErrataRob 4 Jun 2019
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      Reading crypto library code gives the sad tail of how this doesn't really work universally: https://github.com/openbsd/src/blob/b0510ced780f5cbd1d8e820bedd5c8be2840072f/lib/libcrypto/arc4random/getentropy_linux.c …

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    6. Robᵉʳᵗ Graham 😷‏ @ErrataRob 4 Jun 2019
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      Robᵉʳᵗ Graham 😷 Retweeted Will Dormann

      So there's is a long running debate about whether /dev/random is more secure than /dev/urandom, but I don't believe the debate actually exists, despite clear evidence to the contrary:https://twitter.com/wdormann/status/1136021564376436736 …

      Robᵉʳᵗ Graham 😷 added,

      Will Dormann @wdormann
      Replying to @ErrataRob
      Mandatory reading : https://www.2uo.de/myths-about-urandom …
      1 reply 0 retweets 1 like
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    7. Robᵉʳᵗ Graham 😷‏ @ErrataRob 4 Jun 2019
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      So what happened is that some documentation, like a man page for /dev/random, claimed /dev/urandom was insecure, and this has made many people confused. But everyone knows that once /dev/urandom has been seeded correctly, it's absolutely secure.

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    8. Robᵉʳᵗ Graham 😷‏ @ErrataRob 4 Jun 2019
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      By "absolutely" I of course mean "relatively", as secure as anything else in our insecure world. :-)

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    9. Robᵉʳᵗ Graham 😷‏ @ErrataRob 4 Jun 2019
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      Robᵉʳᵗ Graham 😷 Retweeted Saleem Rashid

      So in response to this tweet, no "getrandom()" doesn't work because it's a relatively new function in the Linux kernel, and does exist in a lot of other operating systems.https://twitter.com/saleemrash1d/status/1136022947750141952 …

      Robᵉʳᵗ Graham 😷 added,

      Saleem Rashid @saleemrash1d
      Replying to @ErrataRob
      the best solution is getrandom which AFAIK sidesteps all these issues
      2 replies 0 retweets 0 likes
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    10. Robᵉʳᵗ Graham 😷‏ @ErrataRob 4 Jun 2019
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      So take my 'rdpscan' tool, for example. I had to fix an issue brought up because it didn't compile quite right on Linux kernel version 2.6.32 (CentOS 6.10). The 'getrandom()' function wasn't available until 3.17 of the Linux kernel. And it's not available for macOS.

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      Frank‏ @jedisct1 4 Jun 2019
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      Replying to @ErrataRob

      The libsodium code may be a little bit less scary than the LibreSSL one: https://github.com/jedisct1/libsodium/blob/master/src/libsodium/randombytes/sysrandom/randombytes_sysrandom.c … - There’s also one with an internal RNG: https://github.com/jedisct1/libsodium/blob/master/src/libsodium/randombytes/internal/randombytes_internal_random.c …

      2:48 PM - 4 Jun 2019
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        1. New conversation
        2. Robᵉʳᵗ Graham 😷‏ @ErrataRob 4 Jun 2019
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          Replying to @jedisct1

          I keep meaning to ask: what's the oldest Windows and Linux versions it works on?

          1 reply 0 retweets 0 likes
        3. Robᵉʳᵗ Graham 😷‏ @ErrataRob 4 Jun 2019
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          Replying to @ErrataRob @jedisct1

          Also, how about QNX, VxWorks, Solaris, or z/OS? I ask because I'm writing a little text on network programming, which includes these systems as targets.

          0 replies 0 retweets 0 likes
        4. End of conversation

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