Crypto challenge the answers

Last week, the BBC published an article offering readers a number of crypto-based challenges to solve. Some of the questions and problems posed were straightforward, but some were very complicated.

Below are the solutions for the challenges showing how codes can be broken. Solving the first challenge was simply a case of matching symbols, replacing letters in questions using the provided key. This helped fill in the missing words. Then they tried to find out which of the three options was correct. Applying that to the short sequence of numbers reveals that the answer is: Fibonacci sequence. The key to getting this one right was in the image.

It showed Julius Caesar, who was believed to use codes that shifted each letter a few places to the right or left In the scheme we used, the letters were moved three places to the right. The alphabet wraps, so A = X, B = Y, C = Z, and so on. This gives the answer: under the sleeves. Some codes, like this one, remove letters and numbers and use symbols instead. The letters of the alphabet are distributed across this grid.

This type of cipher is known as pig pen cipher and each symbol is related to a position on a previously prepared grid.  Below is how we choose to arrange the letters of the alphabet. The key to getting this one right was in the image. It showed Julius Caesar, who was believed to use codes that shifted each letter a few places to the right or left. Some codes, like this one, remove letters and numbers and use symbols instead.

This type of cipher is known as pig pen cipher and each symbol is related to a position on a previously prepared grid. The letters of the alphabet are distributed across this grid.Below is the way we chose to arrange the letters of the alphabet.

 

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