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According to Report, Department of Defense and Pentagon is disclosing news of the one of the largest data loss events to date . From investigation, officials to believe the intrusion was orchestrated by a foreign government. The theft of around 24,000 sensitive Pentagon documents occurred in March 2011.
Yes, classified networks are technically uni-directional. Depending on the classification of a particular network, they are always behind a NAT within an already NAT'ed network, and all of the traffic leaving the classified network is encrypted with either 192-bit or 256-bit AES. Nonetheless the keys for the encryption are ridiculously complex.
No, there is no single person that has complete control over all aspects of the network. Everyone has a separation of responsibilities to prevent an insider with all-powerful access being compromised, or sabotaging the network.
The only conceivable method of attack, atleast in my opinion, is through the use of advanced persistent threats. But even then, such an attack would be difficult.Gathering classified e-mail addresses, gathering 0-days, dodging e-mail attachment filters, not tripping an IPS/IDS, routing a shell from an otherwise unroutable network...the list goes on. Not to mention the standard cleaning up after yourself phase.To effectively attack a classified network, you would have to already have extensive knowledge of the specific network you would want to attack.
DISCLAIMER: All information I have just posted is publicly available, and unclassified. I take no responsibility for the actions of others who may or may not use the contents of this post for good or bad.