I know this is from October, but it warrants re-reading now. Today, Yahoo announced a hack of 1B accounts. They say they don't know who it is, but we can conclude it's not the US government because Yahoo is willing and legally able to publicly disclose it. Previously, Yahoo willingly assisted an attacker in compromising 1B accounts. In this case, they did not disclose the attack publicly, or even to their own chief i…
> we can conclude it's not the US government because Yahoo is willing and legally able to publicly disclose it. This implies a potentially fatal assumption that IC agencies perform clandestine activities with prior notice to mission targets.
It's possible however that agency doesn't realise it's a clandestine operation by another US agency. Or they do, but now the operation is complete (this was three years ago) and they want a way of informing yahoo about the breach without admitting who was behind it in the first place.