A new Tengri 137 challenge has shown up. Blog reader Norbert Biermann found the solution – codebreaking at its best. Now the next Tengri 137 puzzle is waiting to be solved.
Three weeks ago I blogged about Tengri 137, an encrypted book that had been published anonymously in August 2016 (thanks to Bernhard Esslinger for the hint). Its existence was made known in a PGP-signed message that was linked in a tweet sent from the Twitter account “Tengri (137)” on September 16.
Unlike the Blitz Ciphers, Tengri 137 was not presented as an antique book. It is clear that it is at most a few years old and only exists as a digital document. It was probably created by a person with a background in mathematics and science. The purpose of Tengri 137 is unclear. It might be the starting point of an internet game similar to Cicada 3301.
Pages 1 to 16 of the Tengri 137 book were already solved, when I published my first article about it. The solution is available in the Tengri 137 Wikia. Pages 17 to 23 are different from the 16 first ones. These seven pages were unsolved, until blog reader Klaus Tappeiner from South Tyrol decrypted six of them in an ingenious act of codebreaking. I wrote about this storyin my blog post from Wednesday last week.
A new challenge
On March 14, which is known as Pi Day among mathematicians, “Tengri (137)” published another tweet (thanks to Klaus Tappeiner for the hint).
This message contained a link to a PGP-signed message that directed to a sound file in MP3 format. Here is:
A day later blog reader nimrodx0 wrote: “Today I have found something very interesting in the recently shared mp3-file from the Tengri (137) Twitter account.” In a spectrogram (a visual representation of the frequencies in a sound) created with Sonic Visualizer he saw the following:
Apparently, this shows a URL. It leads to another sound file (it has WAV format, which isn’t supported by WordPress, so I can’t include it here). This sound file seems to be a long repeating sequence of beep sounds.
The solution
On the same day blog reader Norbert wrote: “I had a quick look at the waveform of the second soundfile. Choosing the right zoom factor, you can see packets that have a length of 16, 32, 48 … 128 ms. Probably they are supposed to be translated to octal numbers 0 .. 7.” Here’s a spectrogram Norbert posted:
Norbert created a transcript of the WAV file. 0 stands for a 16 ms packet, 1 for 32 ms and so on. The maximum value is 8 (144 ms).
00000000000000000000000000000000002130702210221021
30330103120701140121101015102310111201131024010113
10111110330231010221011111033010610510221033010702
40101112021110330231010114101212012120121201201502
12108014105031050310123012301410141012301410141012
30123012301410141012301410141012301230123014101410
12301410141012301230123014101410123014101410123012
30123014101410123014101410123012301230141014101230
14101410123012301410141012301410141012301410123012
30141014101230141014101410123014101410141014101230
12301230123012301410141012301410141012301230141014
10141014101230123012301230123014101410123014101230
14101230141014101410123012301410123012301410141012
30123014101230141012301410141012301230141014101410
12301410141012301230123014101410123012301410123014
10141014101230123014101410123014101410141014101230
14101410123014101410141012301230141014101230141012
30123014101230141014101230141014101410141012301410
14101230141014101410123050310503102130702210221021
30330103120701140121101015102310111201131024010113
10111110330231010221011111033010610510221033010702
40101112021110330231010114101212012120121201201502
12108014105031050310123012301410141012301410141012
30123012301410141012301410141012301230123014101410
12301410141012301230123014101410123014101410123012
30123014101410123014101410123012301230141014101230
14101410123012301410141012301410141012301410123012
30141014101230141014101410123014101410141014101230
12301230123012301410141012301410141012301230141014
10141014101230123012301230123014101410123014101230
14101230141014101410123012301410123012301410141012
30123014101230141012301410141012301230141014101410
12301410141012301230123014101410123012301410123014
10141014101230123014101410123014101410141014101230
14101410123014101410141012301230141014101230141012
30123014101230141014101230141014101410141012301410
14101230141014101410123050310503102130702210221021
30330103120701140121101015102310111201131024010113
10111110330231010221011111033010610510221033010702
40101112021110330231010114101212012120121201201502
12108014105031050310123012301410141012301410141012
30123012301410141012301410141012301230123014101410
12301410141012301230123014101410123014101410123012
30123014101410123014101410123012301230141014101230
14101410123012301410141012301410141012301410123012
30141014101230141014101410123014101410141014101230
12301230123012301410141012301410141012301230141014
10141014101230123012301230123014101410123014101230
14101230141014101410123012301410123012301410141012
30123014101230141012301410141012301230141014101410
12301410141012301230123014101410123012301410123014
10141014101230123014101410123014101410141014101230
14101410123014101410141012301230141014101230141012
30123014101230141014101230141014101410141012301410
14101230141014101410123050310503103302310121101033
02310121101033023101211000000000000000000000000000
00000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000Interpreting zero as a letter divider and any sequence of figures between two zeros as a discrete letter, Norbert got 27 different letters which he transcribed in the order of their appearance as follows:
Thus he received the following letter sequence:
213: a
7: b
221: c
33: d
1: e
312: f
114: g
1211: h
151: i
231: j
1112: k
1131: l
24: m
11111: n
61: o
51: p
2111: q
1141: r
1212: s
12: t
15: u
2121: v
8: w
141: x
5: y
31: z
123: AThus he received the following letter sequence:
abccadefbgheijklmelndjecndeopcdebmekqdjerssstuvwx
yzyz
AAxxAxxAAAxxAxxAAAxxAxxAAAxxAxxAAAxxAxxAAAxxAxxAAx
xAxxAxAAxxAxxxAxxxxAAAAAxxAxxAAxxxxAAAAAxxAxAxAxxx
AAxAAxxAAxAxAxxAAxxxAxxAAAxxAAxAxxxAAxxAxxxxAxxAxx
xAAxxAxAAxAxxAxxxxAxxAxxxA
yzyz
abccadefbgheijklmelndjecndeopcdebmekqdjerssstuvwx
yzyz
AAxxAxxAAAxxAxxAAAxxAxxAAAxxAxxAAAxxAxxAAAxxAxxAAx
xAxxAxAAxxAxxxAxxxxAAAAAxxAxxAAxxxxAAAAAxxAxAxAxxx
AAxAAxxAAxAxAxxAAxxxAxxAAAxxAAxAxxxAAxxAxxxxAxxAxx
xAAxxAxAAxAxxAxxxxAxxAxxxA
yzyz
abccadefbgheijklmelndjecndeopcdebmekqdjerssstuvwx
yzyz
AAxxAxxAAAxxAxxAAAxxAxxAAAxxAxxAAAxxAxxAAAxxAxxAAx
xAxxAxAAxxAxxxAxxxxAAAAAxxAxxAAxxxxAAAAAxxAxAxAxxx
AAxAAxxAAxAxAxxAAxxxAxxAAAxxAAxAxxxAAxxAxxxxAxxAxx
xAAxxAxAAxAxxAxxxxAxxAxxxA
yzyz
djhedjhedjh
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Über den Autor
Klaus Schmeh zählt zu den weltweit führenden Experten für historische Verschlüsselungstechnik. Seine Bücher "Nicht zu knacken" (über die zehn größten ungelösten Verschlüsselungsrätsel) und "Codeknacker gegen Codemacher" (über die Geschichte der Verschlüsselungstechnik) sind Standardwerke. In "Klausis Krypto Kolumne" schreibt er über sein Lieblingsthema.
Meine Bücher
Meine Vorträge
Meine Artikel
In den Medien
Mein Buch "Nicht zu knacken"
List of Encrypted Books
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