No. It is vitally important for NSA not to call attention to their crypto backdoor --- remember, this was inserted in <i>2012</i> --- and external tampering with the PKRNG in a VPN device is a <i>smoking gun</i> that Dual_EC is not a benign standard (still a plausible claim in 2012), but rather a surreptitious key escrow mechanism.<p>No. It is not at all plausible that NSA backdoored ScreenOS in 2012 in order to rekey their backdoor.