Reverse – Vault door 5

Vault door 5 - 300pt

Challenge

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: VaultDoor5.java

Hints

You may find an encoder/decoder tool helpful, such as https://encoding.tools/

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

Solution

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.

picoCTF{c0nv3rt1ng_fr0m_ba5e_64_1177f783}

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