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A form of steganography in which an 'innocent' picture encodes a message.


+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|A |        |     |     |              |        |  |
+  +--+  +--+  +--+--+  +--+  +--+--+  +  +--+  +  +
|  |              |        |       g|     |  |  |  |
+  +  +  +--+  +--+  +--+  +  +--+  +--+--+--+  +  +
|  |  |     |  |  |  |     |     |  |     |   i    |
+  +  +--+--+  +  +  +  +  +--+--+  +  +  +  +  +  +
|  |  |  |     |     |  |  |        |  |     |  |  |
+  +  +  +--+  +  +  +  +--+  +  +--+--+  +--+--+  +
| a   |        |  |  |     |  |  |  |  |  |  |     |
+  +--+--+  +--+  +  +--+  +  +--+  +  +  +  +  +  +
|  |     |  |     |  |1    |        |     |     |  |
+  +  +--+  +  +--+--+  +--+  +--+--+--+--+  +  +--+
|  |        |       2 S  4 | f      |        |  |  |
+  +  +--+--+--+--+--+  +  +  +  +--+  +--+--+  +  +
|     |              |3 |  |  |       h|     |     |
+--+--+  +--+  +--+--+  +  +  +--+--+--+  +  +--+  +
|     |     |  |        |  |            d |     |  |
+--+  +--+--+--+  +--+--+  +  +--+--+  +--+  +  +--+
|    f      |  |     |  |  |  |        |     |  |  |
+  +--+--+  +  +  +--+  +  +--+  +--+--+  +--+  +  +
|     |        |           |     |           |     |
+  +  +  +--+  +--+--+  +--+  +--+  +--+--+--+  +  +
|  |  |  |    e      |c       |  |  |        |  |  |
+  +  +--+--+  +--+  +  +  +--+  +  +  +  +--+  +--+
|  | g            |     |  |           |     |   B |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
The graph of the above maze is:
     /-\       i
A - a  |      / \
     \-/     g   h
              \ /
               f
1-\   /-3-\    |
|  >S<     >-c-d-B
2-/   \-4-/  |
             e
            / \
           f---g

Although the message may not be easily understood, this is one of
many ways to encode information into a maze.

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