DNA computes very slowly; it's bound by viscous drag and brownian noise to
sample nucleotide pair matching. Dry NEMS operates roughly in 100 GHz
regime, tops (complex devices would typically run at 10-100 MHz).
So they are faster than current computers, but the real power comes
because you count your individual computer components in moles. That's the
big jump, as seen from our current capabilities.
here is an interesting recent but brief paper about biological systems and cryptography.
Interesting. This sort of technology will completely change the current situation about cryptography and computing.
We can only hope it will also open new ways of researchs.