[Cryptography] cheap sources of entropy

[James A. Donald]

On 2014-01-31 02:29, Dennis E. Hamilton wrote:
> Of course, if you *know* what the other stream is, you can completely recover the truly unpredictable one.

no, attacker cannot, and defender does not care.

The more entropy sources the better, even if some of them are completely 
predictable to some attackers, and some of them are completely 
controlled by some attackers.