This process is experimental and the keywords may be updated as the learning algorithm improves.Īdleman, L.M.: Molecular computation of solution to combinatorial problems. These keywords were added by machine and not by the authors. Only the person who had an identical stick (playing the role of secret key) with the one used at writing, could have read it. After finishing the writing, the ribbon was unrolled, the message becoming meaningless. Thus the Spartan military used a stick ( scytalae) around which narrow ribbon lather, papyrus or parchment was rolled, spiral by spiral, on which the clear text was written along the axis. There are records that ciphered writings were used since the 5th century BC in Ancient Greece. There were discovered ciphertexts older then 4000 years, coming from the Ancient Egypt. Information (religious, military, economic, etc) was always power, this is why the desire to protect it in order to be accessible only to some elites, dates since ancient times.
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