# How to Complete this Cryptographic Challenge?

I've been trying to solve this cryptographic challenge for months:

Can you decipher me?

QWNobyBxdWUgbmluZ3VlbSBudW5jYSBpcmEgZGVzY29icmlyIHF1ZSBMeTBpdnNwZjhuTlI2ejVnT
VdoUk1pMGl2QzFyT3kwaXZxMU02ejlDdm1wVHZzd2pLbnhZdmxIVHZzd2o2ejVrS202aXY0OFZOa 3cv ==


What I've done so far:

1) I've concatenated the strings:

"QWNobyBxdWUgbmluZ3VlbSBudW5jYSBpcmEgZGVzY29icmlyIHF1ZSBMeTBpdnNwZjhuTlI2ejVnT",
"VdoUk1pMGl2QzFyT3kwaXZxMU02ejlDdm1wVHZzd2pLbnhZdmxIVHZzd2o2ejVrS202aXY0OFZOa", "3cv" and "==".


2) I've deleted the last 2 characters of the string "QWNobyBxdWUgbmluZ3VlbSBudW5jYSBpcmEgZGVzY29icmlyIHF1ZSBMeTBpdnNwZjhuTlI2ejVnTVdoUk1pMGl2QzFyT3kwaXZxMU02ejlDdm1wVHZzd2pLbnhZdmxIVHZzd2o2ejVrS202aXY0OFZOa3cv=="

so I could base-64 decode it, leaving me with: "QWNobyBxdWUgbmluZ3VlbSBudW5jYSBpcmEgZGVzY29icmlyIHF1ZSBMeTBpdnNwZjhuTlI2ejVnTVdoUk1pMGl2QzFyT3kwaXZxMU02ejlDdm1wVHZzd2pLbnhZdmxIVHZzd2o2ejVrS202aXY0OFZOa3cv"

3) I've decoded the string above, leaving me with:
"Acho que ninguem nunca ira descobrir que Ly0ivspf8nNR6z5gMWhRMi0ivC1rOy0ivq1M6z9CvmpTvswjKnxYvlHTvswj6z5kKm6iv48VNkw/", which might be a hint, since "Acho que ninguem nunca ira descobrir que" is portuguese for "I think no one's ever gonna find out that".

4) I've also decoded the string Ly0ivspf8nNR6z5gMWhRMi0ivC1rOy0ivq1M6z9CvmpTvswjKnxYvlHTvswj6z5kKm6iv48VNkw/, giving me the string "/-"ߊ_򳑫> 1hQ2-"ܭk;-"ޭL쀂ߪSߌ#*|XߑӾ̣뿤*n¿ϕ6L?".

However, I don't know what else to do. I know that the solution to this challenge is in the EY{str} format, where str is an arbitrary string. Any help would be greatly appreciated.