Question: Please help me in declaring this encryption library and proofing why it is insecure. I will rate, thank you! 1. Let F be a secure

Please help me in declaring this encryption library and proofing why it is insecure. I will rate, thank you!

Please help me in declaring this encryption library and proofing why it

1. Let F be a secure block cipher and consider instantiating Enc-then-MAC with: our favorite CPA-secure encryption Enc(k,m)=(r,F(k,r)m). - CBC-MAC restricted to 2-block inputs (construction 10.5) The encryption scheme is CPA-secure and the MAC is also a secure MAC since it is used on inputs of only 2 blocks (ciphertexts of the encryption scheme). Because of this Enc-then-MAC will result in a CCA-secure scheme. Show that the result is not CCA-secure when the same key (and same F ) is used for both the encryption \& MAC

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