Passwords - System Issues

Basically there are four possibilities, how systems can be attacked in general:

1. Attacking one account (The intruder tries to guess a specific password)
2. Attempt to penetrate any account (on a system) used to steal a service directly
3. Attempt to penetrate any account on any system to gain access (for example to hide pirated software or pornography)
4. Service Denial Attack (The intruder tries to prevent the legitimate user from using the system)

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