(Since the advent of text, people have always tried to hide some information for certain needs, in order to ensure the security of information. These ancient encryption methods represent several elements of the later developed cryptography, but can only be used within certain limits. The place where the ciphertext was transmitted was ancient Greece, and a Greek named Aeneas Tacticus made the earliest discussion on this in the book "On the Protection of Fortresses". In the 2nd century BC, a Greek named Polybius devised a method of encoding letters into pairs of symbols, using a checklist called Polybius, which included many of the ingredients that would later become very common in encryption systems , such as substitution and transposition.)
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