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A comment on RTL-entropy: Uses RTL-SDR to turn a DVB-T dongle into an entropy source. Parent comment

Re:RTL-entropy: Uses RTL-SDR to turn a DVB-T dongle into an ... by simias on Wednesday March 28, 2018 @08:20AM (#16697111)
That would mean that the attacker can already predict /dev/urandom, rendering it effectively useless. So the parent is right, "the result will be as strong as the best source of entropy", if both sources are bad then the result will be as well.
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