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{"ops":[{"insert":"Q1. Upper case ASCII letters A to Z are represented by the denary numbers 65 to 90; lower case ASCII letters a to z are represented by the denary numbers 97 to 122. The decimal value is converted to 7-bit binary. To encrypt any letter its 7-bit binary value is combined with a 7-bit secret key using bitwise XOR. A 3-letter word has been encrypted one letter at a time. The encrypted word is OQv. If the secret key is 0111000 what was the original (plaintext) message?\u00a0\n\nQ3. Use the RSA cipher to decrypt the word TfG. The public key is N=221, e=5. Decrypt a single letter at a time. You may use an Excel spreadsheet but for full marks you must explain each step of your calculation.\n\nQ4. Alice's RSA public key [N:e] is stored in binary as [1111010011000111:00001011]. Eve wants to find Alice's private key by factorising N. (a) What are the factors of N and what is Alice's private key? \n"}]}
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