Question: 7 . 4 With the ECB mode, if there is an error in a block of the transmitted ciphertext, only the corresponding plaintext block is

7.4 With the ECB mode, if there is an error in a block of the transmitted ciphertext, only the
corresponding plaintext block is affected. However, in the CBC mode, this error propagates. For
example, an error in the transmitted C1(Figure 7.4) obviously corrupts P1 and P2.
a. Are any blocks beyond P2 affected?
b. Suppose that there is a bit error in the source version of P1. Through how many ciphertext
blocks is this error propagated? What is the effect at the receiver?
7 . 4 With the ECB mode, if there is an error in

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