Code #1

Observations

18 characters with the right amount of numbers for a passcode format.

Make a 3×6 grid

Read going left from the upper right D

dcs93together894qm

28 numbers, no real good range for Ascii

[hint]This cipher is usually used for letters[/hint]

Let’s start by making pairs

23 23 42 57 53 31 23 41 32 55 56 55 36 10

The number positions seem to be good for Ascii but the rest is not. Let’s “atbash” those numbers (1=9, 9=1, 0=0)

87 87 68 53 57 79 87 69 78 55 54 55 74 90

Convert decimal to Ascii

WWD59OWEN767JZ

11 characters, the passcode format seems to be there. Those symbols are a real good hint on what to do.

[hint]Flip it[/hint]

With those symbols, it has to be a keyboard flip. Flip everything except for that ? that will become the keyword

bre67?887xa

Simply substitute that ? for question

bre67question887xa