When Christmas approaches, the spies of the Five Eyes intelligence services can look forward to a break from the arduous daily work of spying. In addition to their usual job -- attempting to crack encryption all around the world -- they play a game called the "Kryptos Kristmas Kwiz," which involves solving challenging numerical and alphabetical puzzles. The proud winners of the competition are awarded "Kryptos" mugs.
Encryption -- the use of mathematics to protect communications from spying -- is used for electronic transactions of all types, by governments, firms and private users alike. But a look into the archive of whistleblower Edward Snowden shows that not all encryption technologies live up to what they promise.
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