The Flare-on challenge is an annual CTF style challenge with a focus on reverse engineering. Official solutions have already been published, besides that there are other writeups available too, hence I will just skim through the parts.
Challenge #1
The first was simple. This is base64 encoding with a custom charset. This online tool does the job.
Flag: sh00ting_phish_in_a_barrel@flare-on.com
Fig 1: Challenge 1 |