Passwords have a strange dual nature. The stronger and safer the password the more likely it will be undermined by human weakness.
It is widely known that passwords are the most common means of access control. It is also common knowledge that passwords are the easiest way to compromise a system. Passwords have two basic functions. First, they allow initial entry to a system. Next, after access, they grant permission to various levels of information. This access can range from public data to restricted trade secrets and pending patents.
The best passwords are a lengthy and complex mix of upper and lower case letters, numbers and symbols. The tendency for people when using these formats is to write them down, store them on a hand held device, etc. thus destroying the integrity of the password.
The integrity of passwords can be circumvented through