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  • When to use dev random vs dev urandom - Unix Linux Stack Exchange
    In Linux 4 8 and onward, dev urandom does not deplete the entropy pool (used by dev random) but uses the CSPRNG output from upstream Use dev urandom Exceptions to the rule In the Cryptography Stack Exchange's When to use dev random over dev urandom in Linux @otus gives two use cases:
  • How to generate random number in Bash? - Stack Overflow
    Reading from dev random or dev urandom character special files is the way to go These devices return truly random numbers when read and are designed to help application software choose secure keys for encryption Such random numbers are extracted from an entropy pool that is contributed by various random events
  • Using dev random, dev urandom to generate random data
    Basically the problem reduces that of converting binary data to their string representations on the command line (E g , this won't do: printf '%f\n' $(head -c8 dev random) ) I'm looking for shell-agnostic answers Also, the difference between dev random and dev urandom is not important for this question I expect that any procedure that
  • prng - differences between random and urandom - Stack Overflow
    The dev random interface is considered a legacy interface, and dev urandom is preferred and sufficient in all use cases, with the exception of applications which require randomness during early boot time; for these applications, getrandom(2) must be used instead, because it will block until the entropy pool is initialized
  • linux - Is dev random considered truly random? - Stack Overflow
    About dev random - it depends on implementation In Linux it uses as entropy sources: The Linux kernel generates entropy from keyboard timings, mouse movements, and IDE timings and makes the random character data available to other operating system processes through the special files dev random and dev urandom Wiki
  • How to use dev random or urandom in C? - Stack Overflow
    dev random and dev urandom are convenient, but not as strong as using a HRNG (or downloading a large dump from a HRNG) Also worth noting that dev random refills via entropy, so it can block for quite a while depending on circumstances
  • linux - dev random Extremely Slow? - Stack Overflow
    @Tim Both dev random and dev urandom are seeded from the same CSPRNG dev urandom is not distinguishable from true random, given existing time, cryptanalysis, and computing power The myth that somehow dev random is more "true random" than dev urandom is just that- a myth dev random only blocks with the input entropy pool is exhausted or
  • Why do I need rngd random number generator daemon?
    That's rngd's job: finding things it considers random, and writing numbers calculated on that to the dev [u]random file to fill the kernel's entropy pool Now, on "modern" (last 11 years, Linux 3 16) kernels, that makes little sense: The kernel itself has the ability to gather randomness (and it's in a much much better position to do so)
  • How to generate a random string? - Unix Linux Stack Exchange
    dev urandom is a stream of random "bytes" (which include non-printable characters) base64 encodes byte data into [A-Za-z0-9 +] (which is entirely printable) dd copies input to output applying modifiers given as arguments (which can include block size and block count) OSX base64 < dev urandom | dd bs=1k count=1 Linux
  • Why does dd from dev random give different file sizes?
    Since it's reading from dev random, the two read calls typically return only a few bytes, in varying number depending on the available entropy See also When is dd suitable for copying data? (or, when are read() and write() partial) Unless you're designing an OS installer or cloner, you should never use dev random under Linux, always dev





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