> If you have that, there is nothing to crack.
Alice is a system administrator of xyz.com. She has access to the password that Bob uses on xyz.com. By reverse engineering Bob's password on xyz.com, Alice can then attack Bob's account on pqr.com.
Alice is a system administrator of xyz.com. She has access to the password that Bob uses on xyz.com. By reverse engineering Bob's password on xyz.com, Alice can then attack Bob's account on pqr.com.