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Studying and am stuck on this question, what kind of answer should I get? Consider a classical One-Time-Pad cipher (with the alphabet of 26 capital
Studying and am stuck on this question, what kind of answer should I get?
Consider a classical One-Time-Pad cipher (with the alphabet of 26 capital letters A . . Z and letter addition modulo the alphabet size as the encryption/decryption operation). (a) (10 pts.) Alice and Bob were very uncareful when using the cipher and you managed to intercept the following plaintext and ciphertext: Plaintext: GOODMORNING Ciphertext: FPNELPQOHOF 1 In the hope that Alice and Bob will continue to be sloppy and may reuse the OTP key stream, you want to recover it. What was the key stream that they used? Show your calculations/ argumentation. (b) (5 pts.) What can you say about this key stream in terms of security
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