Question: Consider an application that encrypts messages using AES with CBC mode, and authenticates them using CBC-MAC with the same key and IV. Describe why this

Consider an application that encrypts messages using AES with CBC mode, and authenticates them using CBC-MAC with the same key and IV. Describe why this authentication method is useless in the presence of a CPA adversarythat is, how anyone who can obtain a messages encryption can easily output a valid MAC tag for that message.

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