Attack Steps - •Step 4(Modify Modify T ibest by(A...

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Attack Steps •Step 1 (Initial guess): Generate a fixed number (say 100) of synthetic templates:  T i1 , T i2 , …, T i100 with 25 minutiae •Step 2 (Try all initial guesses): Attack user account with the templates;  accumulate the matching scores:  S(D i ,T i1 ), S(D i ,T i2 ), …, S(D i ,T i100 ) •Step 3 (Choose the best): Pick the best guess ( T ibest ) and the corresponding  score ( S best (D i ) )
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Unformatted text preview: •Step 4 (Modify): Modify T ibest by (A) perturbingan existing minutia (B) addinga new minutia (C) replacingan existing minutia; and (D) deletingan existing minutia Update T ibest and S best (D i ), if score improves •Step 5 (Loop): Repeat Step 4 until success ( S best (D i ) > S threshold ) or until a predefinedumber of attempts is reached...
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