$38.$ With the ECB mode, if there is an error in a block of the

transmitted ciphertext, the corresponding plaintext block is

affected. However, in the CBC mode, this error propagates. For

example, in the following diagram of CBC mode, an error in the

transmitted $C_1$ corrupts $P_1$ and $P_2$ on the decryption end.

Are any blocks beyond $P_2$ affected?

Suppose there is a bit error in the source version of $P_1.$

Through how many ciphertext blocks is the error

propagated? What is the effect at the receiver $($how many

blocks of plaintext are affected$)?$