Compulsory Problems (Tuesday 3 November)
Exercise 4.1 Write 841 in Hexadecimal.
Exercise 4.2 Write 917 in Octal.
Exercise 4.3 Write (hexadecimal) in decimal.
Exercise 4.4 Write 0321 (octal) in decimal.
Exercise 4.5 Calculate the following over :
Exercise 4.6 Using the key , encrypt the message ‘transposition ciphers use permutations’.
Exercise 4.7 Find the inverse matrices over for
You can use Gaussian ellimination in the same way as you would over the reals.