hxp 36C3 CTF

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peerreviewed

by hlt
zahjebischte crypto baby

Difficulty estimate: easy - easy

Points: round(1000 · min(1, 10 / (9 + [58 solves]))) = 149 points

Description:

Because AES is so hard to understand, we went looking for something that is a little easier to follow. This paper (DOI: 10.1109/CCNC.2007.64, PDF) introduces an encrypted protocol that “prevents an attacker from recovering the transmitted information through operations on the encrypted vectors exchanged during the transmission procedure” - in fact, the paper even assures us that “the only identified way one can compromise the protocol security is by applying brute force attacks”. Since this is a peer-reviewed paper (by subject-matter experts, no less) we can be sure that our data is safe! My colleagues are still a bit concerned, though, so I am running this little test in order to prove that the protocol is secure.


Download:

peerreviewed-320d68ba23764d17.tar.xz (2.1 KiB)


Solution:


CTFtime Logo CTFtime: Task & Writeups

Solved by:

# Team Time
🥇 watevr 2019-12-27 20:50:47 +0000 UTC
🥈 okay blue 2019-12-27 20:51:57 +0000 UTC
🥉 Dice Squad 2019-12-27 20:55:43 +0000 UTC
4 r00timentary 2019-12-27 21:00:46 +0000 UTC
5 paunthezen 2019-12-27 21:08:48 +0000 UTC
6 Corrupted Pwnis 2019-12-27 21:11:12 +0000 UTC
7 The Flat Network Society 2019-12-27 21:36:40 +0000 UTC
8 justCatTheFish 2019-12-27 22:08:15 +0000 UTC
9 pasten 2019-12-27 22:13:01 +0000 UTC
10 PPP 2019-12-27 22:15:59 +0000 UTC
11 KJC+f0f+Spotless+SF+mhackeroni 2019-12-27 22:30:53 +0000 UTC
12 5BC 2019-12-27 23:04:10 +0000 UTC
13 Nbz 2019-12-27 23:06:05 +0000 UTC
14 lesglandus 2019-12-27 23:44:34 +0000 UTC
15 kiona 2019-12-28 00:22:14 +0000 UTC
16 Dragon Sector 2019-12-28 00:28:18 +0000 UTC
17 perfect blue 2019-12-28 02:03:33 +0000 UTC
18 p4 2019-12-28 02:36:31 +0000 UTC
19 RedGKFRocket 2019-12-28 03:01:15 +0000 UTC
20 InfoSecIITR 2019-12-28 03:13:04 +0000 UTC
21 $wag 2019-12-28 04:52:45 +0000 UTC
22 Balsn 2019-12-28 07:29:23 +0000 UTC
23 A*0*E 2019-12-28 08:10:54 +0000 UTC
24 celebr0s 2019-12-28 08:49:47 +0000 UTC
25 Pwnies 2019-12-28 09:03:20 +0000 UTC
26 NeSE 2019-12-28 10:47:12 +0000 UTC
27 openctfid 2019-12-28 11:26:14 +0000 UTC
28 Ganesh 2019-12-28 12:13:21 +0000 UTC
29 Datasnokmennene 2019-12-28 12:27:30 +0000 UTC
30 ALLES 2019-12-28 13:15:16 +0000 UTC
31 Tea Deliverers 2019-12-28 13:27:47 +0000 UTC
32 ELT 2019-12-28 13:43:33 +0000 UTC
33 kasia-tutej 2019-12-28 13:43:42 +0000 UTC
34 LC↯BC 2019-12-28 14:25:19 +0000 UTC
35 zehrileLau(n)de 2019-12-28 14:44:55 +0000 UTC
36 polygl0ts 2019-12-28 14:52:17 +0000 UTC
37 LosFuzzys 2019-12-28 15:07:26 +0000 UTC
38 Black Bauhinia 2019-12-28 16:21:34 +0000 UTC
39 cr0wn 2019-12-28 16:40:34 +0000 UTC
40 VztekOverflow 2019-12-28 17:21:20 +0000 UTC
41 Pham Solo 2 2019-12-28 18:04:42 +0000 UTC
42 TSG 2019-12-28 18:23:21 +0000 UTC
43 SEIF 2019-12-28 18:27:10 +0000 UTC
44 /upb/hack 2019-12-28 18:38:10 +0000 UTC
45 RPISEC 2019-12-28 20:18:49 +0000 UTC
46 Northern Coalition 2019-12-28 21:20:09 +0000 UTC
47 meh_mavericks 2019-12-29 07:08:20 +0000 UTC
48 nu117r4c3 2019-12-29 10:07:28 +0000 UTC
49 gf128 2019-12-29 13:03:24 +0000 UTC
50 ENOFLAG 2019-12-29 13:30:03 +0000 UTC
51 ivani 2019-12-29 13:50:51 +0000 UTC
52 FireShell 2019-12-29 14:00:26 +0000 UTC
53 KaisHack GoN 2019-12-29 14:01:00 +0000 UTC
54 Bushwhackers 2019-12-29 15:40:03 +0000 UTC
55 tomcr00se 2019-12-29 17:35:47 +0000 UTC
56 Tasteless 2019-12-29 17:51:15 +0000 UTC
57 SIGFLAG 2019-12-29 17:54:06 +0000 UTC
58 TokyoWesterns 2019-12-29 19:37:48 +0000 UTC