| scarpe basculanti mbt 6/1(日) 11:52:19 No.20140601115219
Earlier cryptography relied on substituting symbol sets, and the alternation of substituted symbol sets. The Caeser Cipher is a classic substitution cipher, though not nearly as tough as a random substitution to crack. Substitution is extremely vulnerable to a known plain text attack, letter frequency analysis is another attack method.
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