📁 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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Wikipedia: Cisco Career Certifications
http://en.wikipedia.org/wiki/Cisco_Career_Certifications