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It is secure. The IV only needs to be indistinguishable from random to an attacker, and it is as long as the salt is random. There is one remark: if you extract more key + iv bytes than the hash function in PBKDF2 returns then the PBKDF2 function is executed twice. An attacker however only has to find the key, not the IV, so an attacker doesn't have to do ...

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