[7 marks] Let’s look at an old Roman age encryption scheme. Let’s say we intercepted a message from a known Celtic hacke

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[7 marks] Let’s look at an old Roman age encryption scheme.Let’s say we intercepted a message from aknown Celtic hacker group. We know from experience that this groupuses the characters from A to Z (allupper case), then a space, and then the numerals from 0 to 9 andemploys a wrap around (moving leftfrom A gives us 9 and moving right from 9 gives us A). The firstleading pairs of letters tell us what thesubstitution code is using the code phrase “Trudy Jones”. Forexample if the first two pairs are uy du thecode is 24 and 32. This would mean that we move the first 2 letters4 places to the right eg. A becomesE), and then the next 3 letters 2 places to the left (eg. A becomes8), then 4 places to the right for the next2 characters and so on to encrypt the message.a. What is the message hidden in: dy un XLIT4MK373W1 ? Rememberthat you will have to reversethe algorithm (i.e. shift left first then right then left etc.) todecrypt the message. Please give theexact message (use the underscore _ to denote any blank spaces inyour answer).