With the ECB mode, if there is an error in a block of thetransmitted ciphertext, only the corresponding plaintext block isaffected. However, in the CBC mode, this error propagates. Let’sstudy the error propagation for CBC mode.
Given we have a cipher that first flips (i.e. convert 1 to 0 and0 to 1) and then right shifts two bits (circular shift). If we usethis cipher in encryption, then the decryption process would beleft shift two bits and do a flip. We use this cipher with CBCmode. Assume we have a plaintext as following: 10101100 0111000111000101, block size is 8. So the plaintext
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