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So What Is AEAD? And Why Is It So Important for Encryption?

Alice creates a secret message and ciphers it with her secret key, and then sends this to Bob. He also has the secret key, and so he decrypts it and reveals the secret message. It says “You can take tomorrow as a holiday”. Bob is happy and takes the holiday. Eve, though, has been listening to their communications, and, the next day, resends the ciphered message, even though she cannot…