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Will this method deliver true non-malleability? No. If we set the ciphertext to the value $(B, B)$, then the decrypted plaintext will have the second block as $B$ (assuming that the PCBC mode uses an implicit plaintext/ciphertext IV of 0; if it's two known constants, it's easy to adjust for that). Even if we ignore this, it also fails to make sure ...

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