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Can anyone recommend a hardened CentOS distro?

I've checked my system by aide and i've received information: changed: /bin changed: /bin/tar changed: /bin/mv changed: /bin/cp changed: /bin/ls changed: /bin/vi i don't remember that I changed those commands, what does it mean? Somebody broken in? or those commands are changed normally? -- This message has been scanned for viruses and dangerous content by MailScanner, and is