Classified documents published by Der Spiegel [46] indicate that NSA is passively decrypting IPsec connections at significant scale. The documents do not descri

Classified documents published by Der Spiegel [46] indicate that NSA is passively decrypting IPsec connections at significant scale. The documents do not describe the crypt- analytic techniques used, but they do provide an overview of the attack system architecture. Due to the Snowden leaks, we know the NSA is doing something that they haven't been able to do previously. The paper just explains, given what we know today, how this is plausible. There's nothing magical about that.