Tok said cryptography 'wasn't a significant part' of cryptocurrencies. He didn't say they don't require them, so what was your point?
Can you (or Tok) point to a part of a cryptocurrency which
isn't cryptography?
Darkcoin's Darksend is not cryptography. Source: Monero fan camp.
Cryptography is all that technology by which we hope to confine and constrain the nature of information, to put up fences and direct it to our exclusive purposes, against all attacks and in defiance of the seemingly (and perhaps actually) impossible.
So Darksend is actually cryptography after all, thanks for confirmation.