The Romans can be called the great inventors of myths with the purpose of propaganda. Think of
Or Augustus: he reunited the Roman Empire; part of his power was due to huge efforts in propaganda, visible e.g. in the mass of coins showing his face, being sent all over the empire. He understood very well, that different cultures used different symbols - and he used them for his propaganda.
Politically the Roman army was an important factor. Propaganda in that case was used for the soldiers on the one hand, but on the other hand also for demonstrating the power of the army to the people, so they could trust in its strength. Even then security was an essential factor of politics. As long as the army functioned, the Roman Empire did as well (
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U.S. intelligence agency within the Department of Defense that is responsible for cryptographic and communications intelligence and security. The NSA grew out of the communications intelligence activities of U.S. military units during World War II. The NSA was established in 1952 by a presidential directive and, not being a creation of the Congress, is relatively immune to Congressional review; it is the most secret of all U.S. intelligence agencies. The agency's mission includes the protection and formulation of codes, ciphers, and other cryptology for the U.S. military and other government agencies, as well as the interception, analysis, and solution of coded transmissions by electronic or other means. The agency conducts research into all forms of electronic transmission. It operates posts for the interception of signals around the world. Being a target of the highest priority for penetration by hostile intelligence services, the NSA maintains no contact with the public or the press.