There is no need to change k, built-in miner doesn't change it.
Eep, you're right. I guess it will come down to platform as to if the hash or the point recalc will be faster.
You said "it will always be slightly slower than just x11 because of the added signature step". This is what I was answering, if you talk about absolute hashrate than SpreadX11 will not be as fast as X11 because of added SHA-2 hashing, if you talk about gpu/cpu ratio than it may be comparable to X11.
I always meant just the advantage factor from parallel implementation (the asic/fpga/gpu/cpu ratios) so again we are agreeing.
Some of your writings seem very strange:
then produce the encrypted signature bits as output. The pool would give the output mapping from pairs of encrypted bit values to bit states so the worker could know the output without needing to decrypt it.
Getting unencrypted value from an encypted one is exacty what decrypting is. You couldn't descrypt value without a need to decrypt it. I for sure I will read carefully all your arguments and look into how it could affect SpreadCoin. The worst thing is probably that in several years we can get some pool with very high overhead compared to solo mining.
This is not nearly as strange as it might seem, or might have seemed a few years ago. The outputs come in the form of multi-mapped encrypted wire states, just like the inputs. An 8 bit value comes out as a list of 8 seperate blind tokens, one for each wire, and each coming from a unique set of 2 tokens for the specific wire, representing the bit states. These wire state values are pairs specific to the output wire, and the function issuer can know their mapping from the ungarbled circuit. It can send (along with delivery of the circuit) the map of encrypted output values to bit states for each wire it wishes to disclose. Armed with these pairs of plaintext/ciphertext, the miner can know bits of output after calculating them by decrypting them by just consulting the partial map, withough being able to defeat the obfuscation of any other wire states.