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Spy Tricks
Challenge
The bunny spymaster found a tiny note in a forgotten dead drop and is now scratching her head; she’s sure she once knew the code, but there are too many swirling aorund in her head right now. Can you help her decipher the message?
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27231 21597 10016 20971 24727 24414 22223 25666 20345 26292
26605 23788 20345 26292 21597 10016 27857 24727 26605 10016
24727 24414 10016 20345 10016 25979 20345 21910 21597 10016
20345 25666 25666 22849 26918 20345 23788 14398 10016 27231
21597 10016 20971 24727 24414 21910 22849 25666 24101 10016
26292 22536 21597 10016 25666 21597 20971 21597 22849 25040
26292 10016 24727 21910 10016 27857 24727 26605 25666 10016
23788 21597 26292 26292 21597 25666 10016 26292 24727 10016
26292 22536 21597 10016 20345 21284 21284 25666 21597 25979
25979 10016 26918 10016 25666 21597 25040 21597 20345 26292
10016 26918 10016 20345 24414 21284 10016 26292 22536 21597
10016 25666 21597 20345 21284 22849 24414 22223 10016 24727
21910 10016 23788 21597 26292 26292 21597 25666 10016 24414
26605 24101 20658 21597 25666 10016 15337 14398 03130 32552
31613 15650 15024 15650 15963 38499 22849 29735 33804 32865
33491 31613 29735 15963 15024 15963 29735 30674 15963 36308
36308 31613 35682 29735 30674 36621 36308 29735 36308 32552
30361 36308 35995 29735 34430 15024 36308 29735 35056 35682
15337 34117 31613 39125 03130 26292 22536 21597 10016 25040
20345 20971 23475 20345 22223 21597 10016 27231 20345 25979
10016 21284 21597 23788 22849 26918 21597 25666 21597 21284
10016 26292 24727 10016 27857 24727 26605 25666 10016 27231
22849 21910 21597 10016 25040 21597 25666 25979 24727 24414
20345 23788 23788 27857 14398 10016 21597 26918 21597 25666
27857 26292 22536 22849 24414 22223 10016 22849 25979 10016
20345 23788 23788 10016 25666 22849 22223 22536 26292 10016
27231 22849 26292 22536 10016 26292 22536 21597 10016 21910
20345 24101 22849 23788 27857 14398 10016 27231 21597 10016
27231 22849 25979 22536 10016 27857 24727 26605 10016 25979
26605 20971 20971 21597 25979 25979 14398 10016 22223 25666
21597 21597 26292 22849 24414 22223 25979 10016 21910 25666
24727 24101 10016 26292 22536 21597 10016 20971 24727 24101
25666 20345 21284 21597 25979 14398 10016 24414 26605 24101
20658 21597 25666 10016 15337 13772 10016 15963 25666 21284
10016 24727 21910 10016 21284 21597 20971 21597 24101 20658
21597 25666 14398 03130
Solution
We applied random characters to this and put it through a cryptogram solver which go us .. quite close
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WESCONGRATULATESYOUSONSASBAFESARRISALYSWESCONFIRMSTHESRECEIPTSOFSYOURSLETTERSTOSTHESADDREBBSSSREPEATSSSANDSTHESREADINGSOFSLETTERSNUMVERSJYUAXQZQXMIZDVCXZXZXZQXKKXHZQLKZKAJKIZFZKZGHJEXNUTHESPACKAGESWABSDELISEREDSTOSYOURSWIFESPERBONALLYYS
and then took that into python where we made more progress with a 52 character subtitution alphabet:
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we congratulate you on a safe arrival. we confirm the receipt of your letter to the address v repeat v and the reading of letter number 1.
HE2023{i_LIKE_303_D3SSEQ_DRS_SHCSP_O0S_NQ1ME}
the package was delivered to your wife personally. everything is all right with the family. we wish you success. greetings from the comrades. number 1: 3rd of december.
Saskia eventually got this into
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HE2023{i_LIKE_303_B3TTER_BUT_THATS_N0T_PR1ME}
Which we tried, and then tried lower case which wasn’t right (:eyes:)
So we tried doing it their way which was clearly intended and did a common factor finder and oh whoopsie it was actually really simple:
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data = open('intercepted_message.txt', 'r').read().replace('\n', ' ').split(' ')
data = map(int, data[0:-1])
print(''.join([chr(x // 313) for x in data]))
and wow that was really simple, we just forgot to also capitalise the I when we uncapitalised the rest:
Flag
he2023{I_like_303_b3tter_but_thats_n0t_pr1me}