The Scientific World Journal

Research Article

Preventing Shoulder-Surfing Attack with the Concept of Concealing the Password Objects’ Information

Algorithm 1

Pseudocode for the proposed algorithm.
SET start offset of first password picture
SET start offset of first password picture
SET
FOR password pictures from the second password picture
 SET cued offset of password picture
 SET cued offset of password picture
 IF cued  = start AND cued  = start THEN
  //Special scenario
  SET target = cued
  SET target = cued
 ELSE
  //Subtract and are intermediate values to get the
  //direction and values (−1, 0, 1)
  //Difference and are used to determine whether the
  //cued picture is on the imaginary line (Scenario 2)
  SET subtract = cued  − start
  SET subtract = cued  − start
  SET difference =
  SET difference =
  SET direction = 0
  SET direction = 0
  SET magnitude = 1
  SET magnitude = 1
  IF difference != 0 THEN
   SET direction = subtract /difference
  END IF
  IF difference != 0 THEN
   SET direction = subtract /difference
  END IF
  IF difference = 0 OR difference = 0 OR
  difference = difference THEN
   //Scenario 2, distance from edge as magnitude
   IF direction THEN
    SET magnitude = start
   ELSE IF
    SET magnitude = maximum Offset − start
   END IF
   IF direction THEN
    SET magnitude = start
   ELSE IF
    SET magnitude = maximum Offset − start
   END IF
   //Prevents the target picture from being outside of grid
   //when the direction is diagonal
   IF difference = difference THEN
    IF magnitude > magnitude THEN
     SET magnitude = magnitude
    ELSE
     SET magnitude = magnitude
    END IF
   END IF
  END IF
  SET target = start + (direction * magnitude )
  SET target = start + (direction * magnitude )
  IF target = cued AND target = cued THEN
   //Scenario's 2 exception
   SET target = target  − direction
   SET target = target  − direction
  END IF
 END IF
 SET start = target
 SET start = target
 INCREMENT
END FOR