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Re: cprng_fast implementation benchmarks

On Apr 23, 2014, at 7:56 PM, Thor Lancelot Simon <> 

> On Wed, Apr 23, 2014 at 02:21:31PM +0000, 
> wrote:
>> I?ve been watching this long stream of messages flying by, and I?m a bit 
>> concerned about the approach.
>> As I understand it, there is a strong RNG, based on RC4 (?ARC4?) in the 
>> kernel today.
> No.  There is a "strong" RNG, based on the NIST SP800-90 CTR_DRBG with AES128
> as the block transform.
> There is also a "fast" RNG, based on RC4.
> We are discussing the replacement of the "fast" RNG.

Ok. But if that’s a non-strong RNG, why are we discussing security properties?  
And why are we considering algorithms this complex, rather than using a PRNG?

In other words, this is being treated like it’s in between a PRNG and a strong 
RNG.  I don’t understand why there can be a middle ground like that, and what 
its required properties would be.


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