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In short, a hacker is someone who programs creatively and usually for pure amusement.
The correct term for someone who breaks into computer systems is a cracker
Hacker versus Cracker
In some cases, the damage may be as little as an altered Web page, the Internet equivalent of graffiti
In other cases, the cracker may wipe out your entire hard drive to cover his or her tracks
Fortunately, there are ways to protect yourself.
Password are the most fundamental security tool of any modern operating system and, consequently, the most commonly attacked security feature
It is natural to want to choose a password that is easy to remember, but very often this means choosing a password that is also easy to guess
Crackers know that on any system with more than a few users, at least one person is likely to have an easily guessed password
Here are some things to avoid when choosing a password:
Do not use any variation of your login name or your full name. Even if you use varied case, append or prepend numbers or punctuation, or type it backwards, this will still be an easily guessed password
Do not use a dictionary word, even if you add numbers or punctuation to it
Here are …
Do not use proper names of any kind
Do not use any contiguous line of letters or numbers on the keyboard (such as “qwerty” or “asdfg”)
Choosing good password
A good way to choose a strong password is to take the first letter from each word of an easily remembered sentence
The password can be made even better by adding numbers, punctuation, and varied case
The sentence you choose should have meaning only to you, and should not be publicly available (choosing a sentence on your personal Web page is a bad idea)
Choosing good password
Ideas for good password
Mrci7yo! : My rusty car is 7 years old!
2emBplib : 2 elephants make BAD pets, 1 is better
ItMc?Gib : Is that My coat? Give it back
As you can see, I even placed emphasis on particular words and used that to remember capitalization of certain letters
The password look like gibberish, but are actually rather easy to remember
Changing password periodically
Even really good passwords can be broken if a cracker has enough time to work at it
That is why periodically changing your password is an extremely good idea
This way, by the time a cracker does arrive at the correct password, it will already be changed to something different