[issue21305] PEP 466: update os.urandom

[Alex Gaynor]

Alex Gaynor added the comment:

It's not a security issue per-se, but if you're doing many small reads, there's such an enormous performance and scalability difference that if users run into an issue, they're likely to work around it by using a non-CS PRNG, and compromising their application security.

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<http://bugs.python.org/issue21305>
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