Question: The method pads the last block with zeros if needed ( a dummy block is never added ) , but the output ciphertext contains only

The method pads the last block with zeros if needed (a dummy block is never added), but the output ciphertext contains only the shaded parts of C1, C2, C3, C4. Note that, ignoring the IV, the ciphertext is the same length as the plaintext. This technique is called ciphertext stealing.

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