3.10 DETERMINISTIC OUTPUT

EXERCISE 3.10: DETERMINISTIC OUTPUT

Run the same inputs through AES-CBC using the same key and IV. You can use Listing 3-7 as a starting point. Change the inputs to be the same each time and print out the corresponding ciphertexts. What do you notice?

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I only changed a single line from Listing 3-7. More specifically, I changed this

for c in ciphertexts:
    print("Recovered", manager.decrypt_message(c))

to this:

for c in ciphertexts:
    print(f"Ciphertext: {c.hex()} Recovered: ", manager.decrypt_message(c))

When we run the new code, we get the following:

One thing that we notice from the above screenshot is that, for a given plaintext we get different ciphertext if we vary the key and IV.