It's pretty common in the industry to assume that your phone number is a reasonable second factor token. But.... that would require the phone companies to exercise even a modicum of caution when doing things like forwarding your number to someone else's
The interesting thing is that Twitter actually allows this. Mat went to them after his got hacked and twitter was like "nope, you lost it. sux for you."
looks like he got it back after he wrote up the story on wired.
I just responded to someone sending by email to me his latest and greatest creation of an encryption algorithm -- that turns out to be Caesar's cipher.
Even spammers have understood the scale of my ambition.
@Adnan This comparison is not a problem in encrypt-then-MAC. I have not looked at their protocol but if it is encrypt-then-MAC, then they don't have to fear timing issues related to MAC (which is one of the reasons why encrypt-then-MAC is better than MAC-then-encrypt).