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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Iris recognition relies upon the fact that every individuals retina has a unique structure. The iris landscape is composed of a corona, crypts, filaments, freckles, pits radial furrows and striatations. Iris scanning is considered a particularly accurate identification technology because the characteristics of the iris do not change during a persons lifetime, and because there are several hundred variables in an iris which can be measured. In addition, iris scanning is fast: it does not take longer than one or two seconds.
These are characteristics which have made iris scanning an attractive technology for high-security applications such as prison surveillance. Iris technology is also used for online identification where it can substitute identification by password. As in other biometric technologies, the use of iris scanning for the protection of privacy is a two-edged sword. The prevention of identity theft applies horizontally but not vertically, i.e. in so far as the data retrieval that accompanies identification and the data body which is created in the process has nothing to do with identity theft.
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The water-clocks are an early long-distance-communication-system. Every communicating party had exactly the same jar, with a same-size-hole that was closed and the same amount of water in it. In the jar was a stick with different messages written on. When one party wanted to tell something to the other it made a fire-sign. When the other answered, both of them opened the hole at the same time. And with the help of another fire-sign closed it again at the same time, too. In the end the water covered the stick until the point of the wanted message.
IDEA is another symmetric-key system. It is a block cipher, operating on 64-bit plaintext blocks, having a key-length of 128 bits.