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We introduce SemanticLock, a single factor graphical authentication solutionfor mobile devices. SemanticLock uses a set of graphical images as passwordtokens that construct a semantically memorable story representing the user`spassword. A familiar and quick action of dragging or dropping the images intotheir respective positions either in a \textit{continous flow} or in\textit{discrete} movements on the the touchscreen is what is required to useour solution.  The authentication strength of the SemanticLock is based on the large numberof possible semantic constructs derived from the positioning of the imagetokens and the type of images selected. Semantic Lock has a high resistance tosmudge attacks and it equally exhibits a higher level of memorability due toits graphical paradigm.  In a three weeks user study with 21 participants comparing SemanticLockagainst other authentication systems, we discovered that SemanticLockoutperformed the PIN and matched the PATTERN both on speed, memorability, useracceptance and usability. Furthermore, qualitative test also show thatSemanticLock was rated more superior in like-ability. SemanticLock was alsoevaluated while participants walked unencumbered and walked encumbered carrying"everyday" items to analyze the effects of such activities on its usage.

SemanticLock: An authentication method for mobile devices using semantically-linked images