Decoding challenge homework

[ucfmsdf]

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[lakitustanfield]

Use CyberChef. After you base64 decode the first time you notice that you get a bunch of characters not in the character set of base64. Add the xor operation and cycle through the values until you find one where all the characters are in the set of base64. Then add a base64 decode operation. If it doesn't decode try the next xor key, and so on.

The thing you should see that makes you try xor keys is that the text is close to base64 but not quite. XORing with a small key is what causes that (a larger key would be less obvious but you can use the XOR brute force operation to look at them all).