Double Trouble

Cryptography 100 pts standard

Challenge Description

Twist: Two encodings, but order matters

Story: The message was encoded twice, but decoding in the wrong order breaks it.

Given: Double.txt : HA3T6ISEGZLT6TZFIZCV2SCMGFGEI43SH5NCKVBOGFHVI===

Hint 1: Look at the symbols. Base64 only uses / and +, but Base85 uses a much wider range of ASCII symbols like @, %, and !.
Hint 2: In encoding, the "Last In, First Out" (LIFO) rule applies. The last encoding used is the first one you must decode.
Hint 3: If you see a lot of = signs at the end and only uppercase letters, think Base32.

Files

↓ double.txt

Hints

        
          View Hint : Hints

Hint 1: Look at the symbols. Base64 only uses / and +, but Base85 uses a much wider range of ASCII symbols like @, %, and !. Hint 2: In encoding, the "Last In, First Out" (LIFO) rule applies. The last encoding used is the first one you must decode.

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