I thought it was spelling the password out in hex given the 0x prefix, but I tried every combination of reading top to bottom and left to right I can try to read the door as (without using the "@", not sure if that's necessary??). I hope the hex letters aren't case sensitive too.
Might give it another go some other time. It was cool that the little squares on the door sort of wiggle up and down ominously. Didn't notice until I went up close to inspect them.