Stephan Mueller <smueller@xxxxxxxxxx> writes: >>-rw-rw-r-- 1 lex lex 2564096 Jul 27 11:36 hwrng.out >>-rw-rw-r-- 1 lex lex 2468394 Jul 27 11:36 hwrng.out.bz2 >> >>Do i understand it correctly, in case of hwrng bzip was able to find >>enough pattern to compressed the data? Even with format overhead? >> >>I'm no an expert, help of an expert would be welcome, added some more >>people to CC > > This one does not look good for a claim that the RNG produces white noise. An > RNG that is wired up to /dev/hwrng should produce white noise. Either by > having an appropriate noise source or by conditioning the output of the noise > source. > > When conditioning the output, you have to be careful about the entropy claim. > For example, you cannot state that the data stream from your noise source has > close to one bit of entropy for each obtained bit. Thus, the conditioner must > ensure that the data from the noise source is collected and its entropy is > maintained and accumulated. > > However, the hwrandom framework does not provide any conditioning logic. And I > would say that such conditioner logic should not reside in a driver either. I > would say that the discussed RNG does not seem fit for hooking it up with the > hwrandom framework. Based on the discussion I'm going to revert this patch, at least for now. -- Kalle Valo -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
