A few months ago, while discussing about cryptography (the art of writing or solving codes), my friend told me about the 75th Anniversary Commemorative Coin. This limited edition fifty cent coin was released on 1 September 2022 by Australian Mint to celebrate the 75th anniversary of the Australian Signals Directorate (ASD). The specialty of this coin is that there are several cryptography puzzles minted on this coin.
One cloudy afternoon, while walking down the street, you see an object tossed out of a speeding car. It is a bag. You are curious to check the contents. The contents look suspicious, so you quickly snap some photographs. Little did you know that you were about to embark on a crazy mysterious adventure.
One cloudy afternoon, while walking down the street, I saw an object tossed out of a speeding car. It was a bag. I was curious to check the contents. The contents looked suspicious, so I quickly snapped some photographs. Little did I know that I was about to embark on a crazy mysterious adventure for the next three days with little to no sleep at all.
Imagine that you and your group of friends want to communicate the latest gossip in the school. You have a strict teacher named Snape who is constantly finding the slightest reason to send you to detention. You and your friends decide to pass on the messages on a piece of paper. If Prof Snape gets hold of this paper, you don’t want him to find out what you are discussing. So, you come up with a clever idea. You shift the alphabet by three positions when you write the message. This right-shifting your alphabet by three makes your A = D, B = E, C = F, . . ., X = A, Y = B, Z = C
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