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today I found myself in front of the following codified text: MzIgVCA2NTg3MjYgNDg1MTY0Nw0KMzIgVCA2NTc5OTkgNDg1MzExMw0KMzIgVCA2NTc0MDUgNDg1MjMxM A0KMzIgVCA2NTg2MzkgNDg1MTgzMg0KMzIgVCA2NTc1NDIgNDg1MzY4NA0KMzIgVCA2NTgwMTMgNDg1MTQ 0Nw0KMzIgVCA2NTc3MzMgNDg1MzMxNQ0KMzIgVCA2NTcyMjggNDg1MzM0Mw0KMzIgVCA2NTc4NDggNDg1 MTY3OA==

I know that the text is composed of geographic coordinates.

and that the text: "MzIgVCA2NTc0MDUgNDg1MjMxM A0KMzIgVCA2NTg2MzkgNDg1MTgzMg0KMzIgVCA2NTc1NDIgNDg1MzY4NA"

corresponds to the coordinates:

32 T 657405 4852310 32 T 658639 4851832 32 T 657542 4853684

MzIgVCA2 NT c0MDU gND g1M jMxMA 0K -> 32 T 657405 4852310 MzIgVCA2 NT g2Mzk gND g1M TgzMg 0K -> 32 T 658639 4851832 MzIgVCA2 NT c1NDI gND g1M zY4NA 0K -> 32 T 657542 4853684

what is the encryption key?

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    $\begingroup$ Do you yourself know the answer? If you don't, the no-computers tag seems a bit unfair; you have no idea how much effort it would require. $\endgroup$ – Joshua Bizley Jul 31 at 22:03
  • $\begingroup$ If this is a puzzle you found somewhere else, could you please edit the question to say (as exactly as possible) where? There are two reasons. The first is that it's a rule around here, to make sure there's no suspicion of plagiarism. The second is that knowing some context may help figure out what's going on with this question. $\endgroup$ – Gareth McCaughan Jul 31 at 22:26
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This is a base64 cipher, as indicated by the two equal signs at the end

The text is deciphered into the following:

32 T 658726 4851647 32 T 657999 4853113 32 T 657405 4852310 32 T 658639 4851832 32 T 657542 4853684 32 T 658013 4851447 32 T 657733 4853315 32 T 657228 4853343 32 T 657848 4851678

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