Guess Which

(KIT-STEGROUP)

There are 16 images here. All are PNG formatted. You can click to see the original images. If you want to have all image files at one time, you may save the whole page as "guess-which.html" by way of your browser's "Save as" function.  Then you will see all image files inside the "guess-which.files" folder.
A B C D
E F G H
I J K L
M N O P

 

Please put a detective cap on and judge each image as "stego image" or "not." You can use any software tool to judge, or you may use only your feeling. In the case of stego, we embedded some data using the Qtech HV program. We confess "Embedded data were all text files." This might (not) be a good clue to decide your judgement.

We welcome your "Detective Report" sent from our message sending page. Your report format  in the message input area should be like the following. "Yes" means your judgement is "stego image", and "No" means otherwise.

------------------------------------------------
<My Detective Report>

  A: No   (Because the brightness histogram is quite normal.)
  B: Yes  (Because of my feeling.)
  C: No   (I understand this simple image is not good for stego image.)
  ...................

  P: Yes  (Because of my feeling)
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After receiving your Yes-No report, we will check it quickly, and give you your "Detective Score" ranging from -16 to +16.  Also, we will let you know the "Access keys" and "Complexity values" to extract the embedded information out of the stego images.

Your detective score will be posted on:

               http://datahide.org/BPCSe/detective-score/abcde.html

(Note that "abcde" is the first part of your email address, i.e., the left side of @, which you have used in the message sending page.)

The page will be closed in  2 weeks or so after posting.

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 (Updated on Jan. 22, 2021 by Eiji Kawaguchi)