Code #1

Observations

Passcode format is there but not in the right way

Let’s start by reversing the string

jnu37tl817st

Rot didn’t give anything, let’s trying Atbash on both letters and numbers

qmf73go293hg

Go is not a valid keyword. We need to find the opposite of go since we used Atbash. Stay is the keyword

qmf73stay293hg

58 digits ranging from 1 to 5

That’s an excellent range for a Polybius square.

Using the table below convert each pair of digits to it’s corresponding coordinate

fomeigeigdifficultsixsixthrjt

fom88difficult663jt

14 characters with the right amount of numbers for a passcode

Bit of an easy one… Split the code in 2

ec64neo

kw596nr

Reverse both strings

oen46ce

rn695wk

Regroup

oen46cern695wk