[header] How to minimise security risks from hackers and crackers [title] Use secure passwords. [step] The passwords you use should contain at least 7, and more than 12 characters if your network supports this limit. It will be useful to use passwords which include letters, numbers and punctuation marks. 
No need to worry if your network does not allow punctuation marks for your password, you can use a combination of letters and numbers. The passwords will be more secure if you drop vowels and replace letters in memorable words.