Computer Science 1. Suppose that we have a 128-bit AES system: • 128-bit AES key; 2B7E151628AED2A6ABF7158809CF4F3C (in hexadecimal notation) • Plaintext: 3243F6A8885A308D313198A2E0370734 (in hexadecimal notation) a) What is the key for the first round in the 10-round AES? (Hint: W0 - W3)

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