There's a followup tweet explaining it, which you wouldn't see if you're not logged in: > This is the first md5 collision with only printable ascii that I know

There's a followup tweet explaining it, which you wouldn't see if you're not logged in: > This is the first md5 collision with only printable ascii that I know of. I have been asked before if this was possible, but I used to respond its not practically doable.