Reverse – Vault door 5

Vault door 5 - 300pt


In the last challenge, you mastered octal (base 8), decimal (base 10), and hexadecimal (base 16) numbers, but this vault door uses a different change of base as well as URL encoding! The source code for this vault is here:


You may find an encoder/decoder tool helpful, such as

Read the wikipedia articles on URL encoding and base 64 encoding to understand how they work and what the results look like.


The source file contains a concatenation of 3 strings, which results in a base64 encoded string. Decode it, you'll obtain another ciphered string, encoded with URL encoding. Decode this again, you'll get the flag.


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