One may argue that if the plaintext does not repeat, using the same IV is safe. Let us look at the OutputFeedback (OFB) mode. Assume that the attacker gets hold of a plaintext (P1) and a ciphertext (C1),can he/she decrypt other encrypted messages if the IV is always the same? You are given the followinginformation, please try to figure out the actual content of P2 based on C2, P1, and C1.Plaintext (P1): This is a known message!Ciphertext (C1): a469b1c502c1cab96696550425438e1bb1b5f9037a4c159Plain
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