Passcode Decoding Walkthrough #011.4 Two codes and AD4

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Back in Passcode Decoding Walkthrough #011.1, we mentioned that Verum Inveniri made a post on Google+ but we didn’t finish exploring that post.

The post is linked to a SoundCloud track titled 45-8-N-1 and upon opening it you will hear annoying tones. The first type of noise you will hear will be the sound of a touch tone phone. You will also hear some morse code intermixed with those touch tones. At the end of the sound clip, you will hear the sound of a dial-up modem.

We’ll be focusing on the morse code sound and leave the other two codes for you to solve. The touch tone has a difficulty of 3/5 and the dial-up modem has a difficulty of 4/5.

Morse Code (Diffuculty: 2/5)

Downloading the SoundCound file and slowing it down will allow for careful extraction of the morse code.

We have extracted the morse code from the file if you want to practice transcribing morse code from an audio file. Thank you Kevin Friedberg (@Traption) for extracting it for us.

... .. -..- -.- . ... . ...- . -. -.-. .. .--. .... . .-. ..- ..-. --- ..- .-. - ..-. --- ..- .-. .-.

Converting the code:

sixkesevencipherufourtfourr
6ke7cipheru4t4r

Unfortunately, when the code was valid, the code above was not valid. Listening to the morse code again, there is a slight gap between the -.- and the . near the beginning. It could either be -.- (k) being -.– (y) or -.-. (c); or the . (e) becoming -. (n) or .. (i).

6ye7cipheru4t4r

Reddit code (Difficulty: 1/5)

On August 13, /u/VerumInveniri replied to a comment on /r/Ingress

..··.·...····.·..··..··...···..·.··...··.···..·..····..·.···.....···.·...··.····.····..·..··.·...···.·....··.···.···.·..

The length of the string is 120 (divisible by 8) and has only 2 characters in it which means it is a perfect candidate for binary!

Treating . as a 0 and · as a 1, we’ll group the result in blocks of 8 characters:

00110100
01111010
01100110
00111001
01100011
01110010
01111001
01110000
01110100
01101111
01111001
00110100
01110100
00110111
01110100

Converting this into ASCII:

4zf9cryptoy4t7t

What’s next?

This concludes our (formerly) live codes walkthroughs. In the next 2 articles, we’ll be looking at Regular Expressions and seeing how they could be used to help solve passcodes.

The Access Dive 4 is up and there are 6 puzzles to solve ranging from 1/5 to 4/5 in difficulty:

  • Welcome to AD4 (Difficulty: 1/5)
  • Unexpected side effects (Difficulty: 1/5)
  • Intuitive feeling (Difficulty: 4/5)
  • 2b | … (Difficulty: 3/5)
  • Proceed as ordered (Difficulty: 2/5)
  • 14-5 (Difficulty: 1/5)

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Passcode Decoding Walkthrough #011.4 Two codes and AD4

by Jack Truong (SQL) time to read: 2 min
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