2
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You took part in a bank heist and wait for your share.
Finally this message comes in:

uMZ6rvnaWF88YQmbHNk3QdoxMj1hPn_htiEbOkNYlTA=

Loc:
gAAAAABdw_LDAgmuZdvcVAV_E-ld96n06pZqAGwEs8mMNW58L-xrNJ90a45WZcJfQd1xOWJPZ_XfsSEXSfSD6epdp1B6d1nVZ7qQTbVAXr8X9irA5I0BGDc=

I wait for you there.

Where do you need to go?

Hint 1:

The first string is the key, the second is the cipher.

Hint 2:

The second string is called a "token" and was created with the Base-64 format.

Hint 3:

This encryption method guarantees that a message encrypted using it cannot be manipulated or read without the "secret key".

Hint 4:

The "=" at the end indicates the format is in Base64.

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  • $\begingroup$ Can we atleast get a hint? $\endgroup$ – The Demonix _ Hermit Nov 11 at 8:07
  • $\begingroup$ @TheDemonix_Hermit I added a hint $\endgroup$ – Nati Nov 11 at 8:34
  • $\begingroup$ … so it is some known encryption like Rijndael, DES, TripleDES, TwoFish, Serpent…(or so) each has 8 modes like ECB, CBC and so…or something else - it is a lot to try… also with some missing/extra characters? $\endgroup$ – Jan Ivan Nov 18 at 12:45
  • $\begingroup$ Yes it's a known encryption method, but no characters are missing or extra @JanIvan $\endgroup$ – Nati Nov 18 at 14:50
  • $\begingroup$ "_" and "-" are not Base64 usual symbols. One of them would be 62nd symbol, second 63rd symbol and for tools use, it needs to be replaced by "+" and "/" I guess? $\endgroup$ – Jan Ivan Nov 22 at 8:58

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