Nowadays when we talk about hackers，most of people think that hackers will always do something bad such as invading someome’s computer/mobile phone to steal the information from users.
However，hackers are not the people who destroy the security of computer system as we understand it,destroying system security and stealing data is the behavior of craker.
Although hacker did invade other’s network system in sometimes,the purpose of intrusion is to find the loopholes in people’s network system so they can make up for the defects and make the network system become more safely and smoothly.
For “craker”, they are invading other’s network to steal the information they need such as business secrets, causing other people’s loss and leading to their own improper interests.
Obviously, I think “hacker” is the indentity to protect network’s safety and “cracker” is the indentity to destory it.