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A well known German drug dealer contacted his accomplice with an encrypted note. The police caught the accomplice during a drug deal and found the note in his backpack.

Note:

(For those who can't open images, it says: STTLBSTBFDBSFDRQCBODBSCBQGGQJLTSTDL)

Police Notes [Alt + Shift + T word]:

STTLBSTBFDBSFDRQCBODBSCBQGGQJLTTDL
B = ? TT = ?

interview information 13.06.2019:
-american accomplice can't speak any german.
-education: information technologist
-usual communication via email. why note?
-accomplice talked to the german drug dealer before
-b

The police failed to decrypt the message. Can you?

Hint 1:

The German had access to a computer but not the Internet.

Hint 2:

The German didn't use a common encrypting method, he created his own with the things he had access to.

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  • $\begingroup$ Are the "[Alt + Shift + T word]" and "b" bits deliberate? $\endgroup$ – Gareth McCaughan Oct 8 at 14:56
  • $\begingroup$ @Nati Could you write out what the picture says? I can't open images. How can the accomplice talk to the German if he can't speak German?? $\endgroup$ – Neo1009 Oct 8 at 17:41
  • $\begingroup$ @Neo1009: The image shows the letters in the Police Notes, handwritten in red throwaway ballpen on crumpled graph paper. Highlighting the TT's and B's must have been done by the police, the letters in the image all have the same weight. (Some Germans speak English, but the two could also communicate in French or Russian, for example.) $\endgroup$ – M Oehm Oct 8 at 17:59
  • $\begingroup$ @MOehm Touché. I didn't think about that. $\endgroup$ – Neo1009 Oct 8 at 22:23
  • $\begingroup$ @GarethMcCaughan Yes they are. $\endgroup$ – Nati Oct 9 at 6:28

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