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The paper briefly describes a team non-programming competition in algorithmic and combinatorial puzzle-like problem solving, developed by the authors and organized for 7-9<sup>th</sup> grade middle school students from Poznań district (Poland)in 2014.
Inspired by CS Unplugged  project that is aimed at presenting important topics in computing, without using computers, we have developed a new supplementary activity on symmetric key encryption. One may use this activity to give a broader understanding of Internet web browser security and its mathematical (cryptographic) principles to primary and… (More)