If you want to stop people reading your secret messages, use a code to conceal the meaning.
From ancient times to the present day, security, codes and puzzles have been intertwined, as have the people who have tried to crack those codes to read messages they were never meant to see.
During World War Two, the code-cracking centre at Bletchley Park was known to recruit people who were a dab hand at solving crosswords and other puzzles. The thinking was that success at those challenges demonstrated an ability that could aid attempts to crack German codes and ciphers.
In the modern day, the ability to work through a problem and decipher it is essential to anyone who works in cybersecurity, partly because a lot of what they do involves working out what is going on with less than perfect knowledge.
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Source Credits: Mark Ward in BBC Technology