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The article (I'm its author) is about programming; it doesn't have strong opinions about how you e.g. configure nginx.

As for keys: it depends on the kinds of keys you're generating. If you're building on OpenSSL's primitives --- which, don't --- it'll be hard to get an RSA key without invoking the OpenSSL CSPRNG. But it's not at all hard to avoid OpenSSL's CSPRNG for AES.

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Thanks for clarifying.

My project depends on bitcoin-ruby, which uses OpenSSL's EC_KEY_generate_key to generate keys. EC_KEY_generate_key, as far as I can tell, uses OpenSSLs internal PRNG. If I understand you correctly, this is unsafe and it would be better to derive a key from urandom.

Reliance on OpenSSL's CSPRNG isn't a hair-on-fire problem; if it was, your hair would literally be on fire right now, because lots of things do. I just don't think it's a great idea for new code to perpetuate the habit.

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