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The challenges gives a file called esab64 with an encoded message. The first thing i though was trying to decode the message with base64. The thing is that the result was not... something clear. After a while, an idea came to my mind: esab64 looks like base64 but in reverse so... why not trying to reverse the initial message and then decode it with base64. My idea seems to have worked:


I just had to reverse that message again to get the flag: