密码学资料全
自从有了文字以来，大家为了某种需求老是想法设法隐藏某些信息，以起到确保信息安全的意图。这些古代加密方法表现了后来发展起来的密码学的若干要素，但只能限制在必定范围内使用。传输密文的打造地是古希腊，一个叫AeneasTacticus的希腊人在《论要塞的防护》一书中对此做了最早的论述。公元前2世纪，一个叫Polybius的希腊人设计了一种将字母编码成符号对的方法，他使用了一个称为Polybius的校验表，这个表中包括很多后来在加密系统中非常常见的成分，如替代与换位。(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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