hxp 36C3 CTF

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onetimepad

by iead
pwn

Difficulty estimate: hard - hard

Points: round(1000 · min(1, 10 / (9 + [24 solves]))) = 303 points

Description:

onetimepad

I always wondered how old secret agent movies would translate into current time. Listening to number stations, hastily scribbling letters onto a sheet of paper, reading off your orders, and then the paper self-igniting just as you finish reading…

I mean, who even has pen and paper with them anymore? Well, some Non-Specific Agency (NSA) moved the self-igniting paper into the cloud and called them “One Time Pads”, as they are proven to be secure.

Download:

onetimepad-3dacecfee0c81326.tar.xz (13.7 KiB)

Connection:

nc 88.198.154.140 31336

Solution:

CTFtime Logo CTFtime: Task & Writeups

Solved by:

# Team Time
🥇 Dice Squad 2019-12-27 22:53:11 +0000 UTC
🥈 perfect blue 2019-12-27 23:48:50 +0000 UTC
🥉 OpenToAll 2019-12-28 00:02:50 +0000 UTC
4 Shellphish 2019-12-28 00:20:16 +0000 UTC
5 p4 2019-12-28 03:21:00 +0000 UTC
6 5BC 2019-12-28 03:35:27 +0000 UTC
7 pasten 2019-12-28 04:15:51 +0000 UTC
8 Balsn 2019-12-28 04:30:47 +0000 UTC
9 CodeRed 2019-12-28 05:00:53 +0000 UTC
10 RPISEC 2019-12-28 05:52:29 +0000 UTC
11 r00timentary 2019-12-28 06:28:57 +0000 UTC
12 TokyoWesterns 2019-12-28 07:01:10 +0000 UTC
13 $wag 2019-12-28 11:11:27 +0000 UTC
14 r3kapig 2019-12-28 14:23:56 +0000 UTC
15 KaisHack GoN 2019-12-28 14:34:50 +0000 UTC
16 A*0*E 2019-12-28 22:32:52 +0000 UTC
17 Dragon Sector 2019-12-29 04:03:01 +0000 UTC
18 NeSE 2019-12-29 04:44:00 +0000 UTC
19 10sec 2019-12-29 07:06:22 +0000 UTC
20 LC↯BC 2019-12-29 15:17:50 +0000 UTC
21 openctfid 2019-12-29 15:37:41 +0000 UTC
22 Nbz 2019-12-29 16:02:29 +0000 UTC
23 badfirmware 2019-12-29 17:15:04 +0000 UTC
24 TSG 2019-12-29 17:55:01 +0000 UTC