도훈이집 Math Captcha

Math Captcha
Secure image

None

* CAPTCHA calculation. ex)

  1. uppercase lowercase alphabetic characters are input to distinguish.
  2. Multiplication: 3a x 4B = 12aB
  3. division: 20a / 2 = 10a
  4. Addition: 10a + 10a = 20a
  5. Subtraction: 20a - 10a = 10a
  6. comparision: 20 vs 10, small 10
  7. comparision: 20 vs 10, large 20

* CAPTCHA option.

  1. Sprinkle with the desired number of random ellipse in the background.
  2. Sprinkle a number randomly in the background.
  3. Sprinkle the text randomly in the background.
  4. Sprinkle the operator randomly in the background..
  5. Foreground, background.

* Applied Links

  1. Main
  2. WebLog
  3. FunBoard