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(b)  If a Simple Substitution Cipher is used (with an unknown key) and we interc...

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(b)  If a Simple Substitution Cipher is used (with an unknown key) and we intercept the ciphertext OXAO then which of the following four-letter words could be the plaintext: JOHN, SKID, SPAS, LOOT, PLOP, OSLO? 

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