📁 密码学
Cryptography is the art of creating and using cryptosystems. Cryptosystems are methods of rendering messages such that only a select group of people may read them in the original form. This category contains sites related to cryptography, as well as cryptanalysis (the art of breaking cryptosystems).
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The Testing Center Experience
http://www.techiwarehouse.com/cms/engine.php?page_id=99ba92a7#What to Expect at the Testing Center