Home Solutions a) Give a ciphertext (encrypted under the same AES key) in which 7:00 has been changed to 8:30 in the plaintext.
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Questions 1. Altering a text encrypted with an AES key under CBC. [10%]
You are given an encryption of the message below, encrypted with an AES key (which you are not given) using CBC with PKCS5 padding. Advance 5km East with all due speed: 7:00 on 2nd
a) Give a ciphertext (encrypted under the same AES key) in which 7:00 has been changed to 8:30 in the plaintext. [4%]
b)State what other parts of the plaintext will change as a result of the change in (a). [2%]
c) Explain why you cannot use the approach used to solve part(a) to change the word speed to the word haste within the plaintext.
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