We have a file "deterministic.txt" that contains a lot of numbers. Took me a while to figure this out. I searched the forums for hints and found that we should remove duplicates and reorder the list.
100 H 110
110 T 111
111 B 112
112 { 113
113 l 114
114 0 115
115 l 116
116 _ 117
117 n 118
118 0 119
119 p 120
120 e 121
121 } 122
9 18 69
3 61 5
69 93 22
1 36 10
9 18 69
3 61 5
69 93 22
1 36 10
17 27 20
22 28 18
12 89 1
22 28 18
12 89 1
...and so on...
I used Excel to sort the list and remove any duplicates. Ignoring the HTB part which is 110 until 121. We'll get something like this:
0 33 3
1 36 10
2 93 6
3 61 5
4 93 1
4 93 17
5 43 9
6 54 4
9 18 69
10 93 13
11 54 122
12 89 1
13 29 2
15 28 68
17 27 20
...
...
...
If we put the numbers in the middle into Cyberchef we'll get some decoded text and it looks like the flag. Yay! But not quite...
Referring to our hint in the txt file,
100 H 110
110 T 111
111 B 112
112 { 113
113 l 114
114 0 115
115 l 116
116 _ 117
117 n 118
118 0 119
119 p 120
120 e 121
121 } 122
100 = H, 110 is the number that you go to next, which has the character T. 110 = T, 111 = B and so on...
Now, if we put back the decoded characters into Excel,
0 H 3
1 M 10
2 4 6
3 T 5
4 4 1
4 4 17
5 B 9
...
...
...
0 = H, and then the next number is 3 so 3 = T, and then next number is 5 which is B and so on...
Finally, we got the flag! Woohoo!
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