The former user Lukas Rotter
has had1 an intriguing profile picture:
This looks like it's some kind of encrypted message! And just to confirm my suspicions, on his profile he says:
By the way, my profile picture is also a little puzzle. You'll get +0 reputation if you solve it!
Now I'm a generous soul, so I'm going to award you at least +25 reputation if you solve it, and I'm sure you'll get more +10's from others too! How's that for a deal?
What is the solution of the puzzle in Lukas Rotter's profile picture?
Note 1: That user has now deleted their account; however, this puzzle is still self-contained and valid.
Note 2: I do not know the solution myself. Obviously Lukas does, so you'll have to ask him for any hints or clues.
Note 3: this isn't the first puzzle I've done like this, by the way ;-)