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2

The Caesar cipher, Vigenere, monoalphabetic substitution, the autokey cipher, columnar transposition, the Playfair cipher, the Rail Fence cipher, disrupted transposition, the ADFGVX cipher, Quagmire III, etc., are all interesting and good to understand, but compared to modern cryptographic systems they are almost always utterly worthless for providing real-...


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Classical ciphers operate on letters. If we consider the frequency attack on classical ciphers it considers the frequency of the letters. Modern ciphers, if we consider only block ciphers, operates on blocks - 64, 128, or more bit blocks. Let see how you can perform a frequency attack on modern ciphers to infer some data. Example attack on Databases: Let ...


1

This answer applies to cryptographic algorithms in general, rather than specific cases where the plaintext data must have specific properties. For such a situation, see kelalaka's answer. Frequency analysis is not a new attack, and as such, the encryption functions in use today are designed to resist frequency analysis. Having said this, there are two ...


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