CRYPTO4 – haXOR

This challenge gives us the following information:

Scenario:

There are weird engravings of letters and numbers on rocks in the planet Kimaprim. We’ve managed to collect one of them. Credit: Byrch B.

Prompt:

Please decrypt the following: 78 76 74 4A 69 7E 63 6E 00 15 6E 74 50 42 68 4C

Flag format:

IGE{XXX_XX_XXXX}

By looking at the title(haXOR) we can pice together that this task is just a simple XOR cipher. To solve it we can either solve it normally, by using an XOR brute forcer, or we can cheese it using CyberChef’s “Magic” function with the flag prefix used as a known string and Intensive mode on. Doing this gives us the flag and the XOR Key of 0x31:

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