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No OFB_DRBG isn't directly vulnerable to attacks. However from a theoretical standpoint there is one point speaking against it and in favor of CTR_DRBG. Speed. CTR can be parallelized (can encrypt counters in parallel), OFB can't (encrypting state over and over again) So the main reason is speed I'd guess and of course adding OFB_DRBG wouldn't have added ...

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