Although there may be a zero-width unicode character.
It's possible that there is a better way to do what you want to do, but first we need to know why so we can tell you that better way.
My Computer
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Apple 17" iMac MA199LL (Early 2006)
OS
Windows 8 Pro (32-bit)
CPU
1.83GHz Intel Core Duo
Memory
2GB 667MHz DDR2 SDRAM (PC2-5300) (upgrade)
Graphics Card(s)
ATI Radeon X1600 with 128MB GDDR3 memory
Monitor(s) Displays
17-inch TFT active-matrix LCD, millions of colors
Screen Resolution
1440 x 900
Hard Drives
Hitachi 320GB HDT721032SLA360 7200RPM SATA II (upgrade)
I'm not sure what you mean by "hidden characters." I've never heard of it? What process would need to be done to ensure that only you or someone you trust could see the characters? You could encrypt the file using Kleopatra, it works great.
Well the problem is this. At a certain unnamed website, I've had to create three different accounts in the last 60 days because a troll keeps hijacking my username and has logged into an account using my name. Complaints to the administrators about it have been ignored so I suspect he's either cracked my password (which was somewhat unique) or is using my username but adding hidden characters to it to fool the website into thinking it's a different username. Changing my password doesn't seem to have helped.
I need to come up with some kind of plausible proof of what's going on here since my requests have either been ignored or they're saying nothing's wrong.
It's ridiculous. Has anybody encountered this kind of situation before?