As I mentioned in Tuesday's lab, the input from the keyboard for lab 3 is restricted to the hex digits, 0-9, A-F, and does not include the rest of the keys. This restriction is applied so that KB_HEX can produce a 4 bit value, and the final encrypted output is only 8 bits (2 hex digits, which we have room to display).
As in lab 2, you can use the keypad and/or the top row for the numeric entries.
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