Original Publication Date: 1997-May-01
Included in the Prior Art Database: 2005-Apr-01
Akai, T: AUTHOR [+2]
Disclosed is a method for using hand-drawn shapes as passwords. A user can draw a graphical shape (not a signature) as a password on a guide template that stabilizes the shape of the drawing.
a method for using hand-drawn shapes as passwords.
A user can draw a graphical shape (not a signature) as a password on
a guide template that stabilizes the shape of the drawing.
Figs. 1 and 2
show examples of guide templates. The
occupies a small space, the same size as one character box in the
input area. It contains short horizontal, vertical, and diagonal
segments, which can be used to represent various graphical shapes.
For example, the guide template in Fig. 1 contains 16 segments. The
number of single segments that can be drawn is 32 = 16*2, if the
drawing direction is taken into account. Thus, drawing N
disconnected segments fives 32**N different graphical shapes, a
number large enough for security even with a small value of N.
password, a user can draw a graphical shape that consists
of an arbitrary number of hand-drawn strokes, each connecting an
arbitrary number of segments, which ensures the safety of the
password. Figs. 3, 4, and 5 show examples of passwords drawn by
using the guide template in Fig. 1. A user can draw strokes one on
top of another, as shown in the three parts of Fig. 5; consequently,
the input space for the password can be as small as one character
box. In Fig. 5, seven strokes representing the letters "IBM" are
drawn on a single guide template. Even if the password implies the
shapes of characters, it does not cause a safety problem, since ther...