This year the FLARE On challenge came much longer and harder than the last year's with a lot of pitfalls that slow your progress. The challenge this year is composed of eleven levels, starting with easy ones and then getting harder as you move on. In this walkthrough I will try to keep it short as possible while highlighting the pitfalls of every level.
I recommend that you download the attached files (includes the challenge files) before reading the walkthrough from the following link,
I hope you will have fun reading the walkthrough!
First Level is simply XORing the input string with 0x7D then compare it with constant 24 bytes.
XORing the constant 24 bytes will yield our first email firstname.lastname@example.org