Unauthorized Access


How to convince a computer who you are:

Passwords or identification numbers

If the login to some system depends on a password, it may not be too safe. There are only 26^6=308,915,776 possible 6-character passwords if you use only characters, no numbers or special symbols. That's possible to crack for a computer. Therefore passwords are safer if the system realizes when several unsuccessful attempts are made and responds accordingly. For credit card pin numbers, AT machines have this property.

Possessed objects

Biometric devices

like fingerprints.

Callback Systems

you dial in, then the system calls you back.

go to the Encryption page

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Erich Prisner, April 2005