| Summary: | 碩士 === 輔仁大學 === 資訊工程學系 === 97 === Authentication becomes more and more important. Transactions, like paying payment, transfer accounts, stock trading, are authorized to take actions after successful authentication.
In traditional text-based password scheme, users tend to choose passwords composed of vocabularies and authentication step might be recorded by trojan programs or camera. Because of text-based Password scheme’s weaknesses, i.e. vulnerable to Dictionary Attack and Shoulder-surfing Attack, make the scheme insecure.
Nowadays many scholars propose an alternative direction: Graphical Password. It is resistant to Dictionary Attack. Some of them even proposed Graphical Password schemes which can resist Shoulder-Surfing Attack.
In this paper, we propose a Graphical Password Scheme: Screen Drag and Drop, which can effectively resist Shoulder-Surfing and Dictionary Attack. It also can provide pretty strong Password Space. Compare to traditional text-based password, users tend to choose passwords composed of vocabularies. In our Screen Drag and Drop Scheme, types and patterns of icons which are classified by us are going to have similar probability to be chosen by users.
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