I can't. The ibrkfy sample offers a lot more protection against that type of attack, as you can see below. You offer a lot less contrast and you have noise with the same luminance levels as the letters, which doesn't allow me to get rid of it while maintaining legibility for the OCR. I think it can still be read. But you'd need a very good OCR.
Problem is that the "ibrkfy" sample is also a lot harder to be read by a human :(
Especially if you apply some of the good advise above, like warping and different fonts between letters.
Attachment 9805