Tuesday, December 2, 2008

Frequency Analysis

Frequency Analysis is a cryptanalysis technique of studying the frequency that letters occur in the encrypted ciphertext. In English, certain letters are more commonly used than others. This fact can be used to take educated guesses at deciphering a Monoalphabetic Substitution Cipher.

Here is the alphabet in order of the frequency that each letter is used.

E, T, A, O, I, N, S, R, H, L, D, C, U, M, F, P, G, W, Y, B, V, K, X, J, Q, Z

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