[tor-talk] Hello I have a few question about tor network

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I subscribe tor-talk
 
Hello I'm Korean student studying security
First of all sorry for my bad english. 
I have a few question about tor network
 
1. Tor network is 100% security network? that can not be hacked by other cracker?
 
2. If not, How can cracker attack tor network that tor can't prevent?
 
thank you for tor browser.
from HyeonJun