As far as we know. It could be similar to Dual_EC_DRBG encryption. Some technique unknown to the public could potentially exist in it, and if the NSA is Satoshi, the likelihood goes way up.
I would expect the weaknesses to be in the exchanges. Load 'em up with pretend money from many mule accounts, convert to fiat, drain 'em down. 1920's bucket shops all over again but digital, easier and safer to launder from afar. Exchange vanishes with no audit trail, ledgers remain.