Linux user password detection, crack
Security User password under Linux detection systems, whether complex security password complexity requirements.
Download john detection software
wget http://www.openwall.com/john/j/john-1.8.0.tar.xz
unzip
tar xf john-1.8.0.tar.xz
Make compile & install
cd john-1.8.0/src/ make make clean linux-x86-64
First users of the system password file backup
sudo cp /etc/shadow /opt
Detection password file (backup file can be detected)
cd ../run/ sudo ./john -single /opt/shadow
Simple password will print out the application username eleven.
Recommendation: server user password must ensure password security
if other, more powerful detection (crack) passwords tool Comments are welcome