Crypt = Hidden Graphy = Writing Cryptography is used to protect information and communication through codes.
possible. The cryptographic techniques used today, however, are the result of an incredibly long history of development. Since ancient times, people have used cryptography to transmit information in a secure manner.
By later periods of antiquity, cryptography was widely used to protect important military information, a purpose that it still serves to this day. In the Greek city-state of Sparta, messages were encrypted by being written on parchment laid over a cylinder of a particular size, making the message undecipherable until it was wrapped around a similar cylinder by the recipient. Likewise, spies in ancient India are known to have used coded messages as early as the 2nd century BC.
In 1465, Leone Alberti developed the polyalphabetic cipher, which is considered the solution against Al-Kindi's frequency analysis technique. In a polyalphabetic cipher, a message is encoded using two distinct alphabets. One is the alphabet in which the original message is written, while the second is an entirely different alphabet in which the message appears after being encoded.
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