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A partial password is a mode of password authentication intended to make keystroke logging and shoulder surfing less effective.
By asking the user to enter only a few specific characters from their password, rather than the whole password, partial passwords help to protect the user from password theft. As only part of the password is revealed at once it becomes more difficult to obtain the password using techniques such as keystroke logging or shoulder surfing.
A paper by David Aspinall and Mike Just describes partial password implementations and attacks in a detailed study.
Tested with 110,000 simulations using passwords longer than 8 characters long, Junade Ali has noted:
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