There are three main types of Passwords.
Strings of Characters
Strings of characters the most basic level of passwords(strings of characters,numbers and symbols).Access to a keyboard or keypad allows entry of these types of passwords. These passwords are simplest. To the more complicated combinations of characters,numbers and symbols that are recommended for protecting highly confidential information.
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Strings of Characters Plus a Token
The next level in password is to require a string of characters,numbers and symbols plus a token of some type,Ex.ATM which requires a card , The token plus a personal identification number or pin.
Biometric Passwords
Biometric Passwords this is the use of non-reproducible biological features, such as fingerprints or facial features to allow access. Ex retinal scan ,In which the retina which is the interior surface of the back of the eye is photographed. The retina contains a unique pattern of blood vessels that are easily seen and this pattern is compared to a reference. Biometric passwords are the most sophisticated and are considered “safer” but in reality a password that you 'carry' in your finger or eye is no safer than a strong password that you carry in your mind.
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