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Humans possess a large amount of, and almost limitless, visual memory, thatassists them to remember pictures far better than words. This phenomenon hasrecently motivated the computer security researchers' in academia and industryto design and develop graphical user identification systems (GUISs).Cognometric GUISs are more memorable than drawmetric GUISs, but takes more timeto authenticate. None of the previously proposed GUISs combines the advantagesof both cognometric and drawmetric systems. A signature personify a person anda graphical signature is easier to recall than other drawings. This paperproposes a new graphical Signature-based User Identification System named SUIS.It is based on a 2D grid technology, that is used to draw, digitize and storethe signature for user identification. SUIS is categorized as both acognometric and drawmetric system. Unlike other systems that use 2D grid: Wetake one cell in a grid as one pixel in the drawing; for signature matching,the signature drawn has to follow the same grid cells as the signature stored,independent of the sequence; and that the system is not based on any machinelearning model. Increasing the number of grid cells increases the passwordspace, and decreasing the size of the grid cell increases the precision of thesignature. These characteristics makes SUIS: (1) Rigorous enough to be apassword system, but easy enough to be usable. (2) Independent of the languageand device used to draw the signature. (3) Efficient and practical to be usedfor online authentication systems.

SUIS: An Online Graphical Signature-Based User Identification System