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T might try something a little trickier
He can encrypt something that isn't the real map
Maybe it's a modified version of the map, for which he does know an itinerary
Or maybe it's just full of garbage
| 
 | |||
| A B | B C | C D | |
| D E | E F | F G | |
| G H | H I | I J | |
| J A | Yob Gorgle | Yob Gorgle | |
| Yob Gorgle | Yob Gorgle | Yob Gorgle | |
 
If V flips tails, T can reveal something that appears to be a legitimate itinerary
| 
 | |||
| A B | B C | C D | |
| D E | E F | F G | |
| G H | H I | I J | |
| J A | Yob Gorgle | Yob Gorgle | |
| Yob Gorgle | Yob Gorgle | Yob Gorgle | |
V is fooled!
 
But if V flips heads, T is required to divulge all the encryption keys
| 
 | |||
| A B | B C | C D | |
| D E | E F | F G | |
| G H | H I | I J | |
| J A | Yob Gorgle | Yob Gorgle | |
| Yob Gorgle | Yob Gorgle | Yob Gorgle | |
V will see that T is screwing around
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