Is arc4random() thread safe?

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Created Jun ’15

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I have seen many articles recommending the usage of `arc4random()` and `arc4random_uniform()`. But are these methods thread safe?

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DTS Engineer OP

Apple

Jul ’15

They are. You can see this in the Darwin open source code for these routines.

However, if you're trying to generate a small number of cryptographically sound random numbers—for a symmetric cypher IV, for example—I generally recommend SecRandom.

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