One failing of an encryption system occurs if we never let the encrypted value o

Question

One failing of an encryption system occurs if we never let the encrypted value of a letter be the same as the original, especially if a letter always encodes to the same value. Let’s see how we can exploit these weaknesses. Let’s assume that we know that the word FOLLOW is in an intercepted message. If we received the following transmission, what are the encrypted values (give the mappings to their encrypted values) of the letters F, O, L, W? 6D6N9W68PWPKBKHHKS To test your detective skills, what is the original message that was sent (be exact)?

Explanation / Answer

If FOLLOW is to be in the encrypted message ' 6D6N9W68PWPKBKHHKS' it will surely be 'BKHHKS' since it matches the order and type of letters ( 2 same letters separated by two adjacent same letters)

Therefore

F=B

O=K

L=H

W=S

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