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On Windows OpenSSL RAND_bytes (underlying implementation is RAND_poll in crypto/rand/rand_win.c) may be blocked at NetStatisticsGet. https://wiki.openssl.org/index.php/Random_Numbers#Windows_Issues Instead of this, use Random.raw_seed directory (whose implementation CryptGenRandom is one of the source of entropy of RAND_poll on Windows). https://wiki.openssl.org/index.php/Random_Numbers Note: CryptGenRandom function is PRNG and doesn't check its entropy, so it won't block. [Bug #12139] https://msdn.microsoft.com/ja-jp/library/windows/desktop/aa379942.aspx https://tools.ietf.org/html/rfc4086#section-7.1.3 https://eprint.iacr.org/2007/419.pdf http://www.cs.huji.ac.il/~dolev/pubs/thesis/msc-thesis-leo.pdf git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54144 b2dd03c8-39d4-4d8f-98ff-823fe69b080e