This challenge gives us a file with a base64 string inside. eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpZCI6IjE5NDc1MSIsIm51bWUiOiJNaWhhaSBWaXRlYXp1bCIsInBhc3N3ZCI6IkFCU08tQ1RGe2ZuaTMkTUZrSyRtMXZWNTJmbHY1OFYhTm12TjF9In0.frWBx3TnYJKYzj0BlGtcl1EJdj9uDPuRo5UNFQjerBE Coverting it from base64 to ASCII using CyberChef gives us this: {“alg”:”HS256″,”typ”:”JWT”}{“id”:”194751″,”nume”:”Mihai Viteazul”,”passwd”:”ABSO-CTF{fni3$MFkK$m1vV52flv58V!NmvN1}”}..`qÝ9Ø$¦3.@e.×%ÔB].Û.>ähåCEB7«. Which is a cookie that contains the flag: ABSO-CTF{fni3$MFkK$m1vV52flv58V!NmvN1}