I'm Keivan Rezazadeh with nickname 4TT4CK3R and student of orientation of computer software. I am White hat hacker. I work as a professional about security since 2014 in the cyber world. My main expertise to secure Windows and Linux servers. Also, in addition to the world of open source and Linux in these areas I am familiar and activities. In several places, educational videos and articles on my expertise has been put by myself. For example my personal weblog and another places that addresses of them are presented on this site.
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