But surely as long as the energy you're using to provide the electricity for electrolysis is renewable and freely available, it matters less?
As many have stated, hydrogen is just a portable energy transfer mechanism.
It is a less efficient method than rechargeable batteries in terms of how much energy is actually transferred, but you gain in terms of the equivalent weight/storage space, at least in theory.
A lot of people are complaining that most current hydrogen is sourced from hydrocarbons, etc.
This is true, but it doesn't always have to be that way. Wind, tide and hydro-dam power is all harnessed (albeit on a small scale at the moment, but this may change) to produce electricity, and hydrogen can be obtained using electrolysis of water. Water will always be readily available, as using the hydrogen will combine with the oxygen in the atmosphere back into water, there is the infrastructure available to transport the hydrogen (at the moment transporting natural gas, but again probably convertible), and there is never a shortage of weather!
My two pennies.
He's talking about changing only two random pixels out of the entire random bit field at a time, which is not as easily breakable but still can be done.
The difference would be, when there were plenty of pixels that had changed from the initial image (like there were when we were able to diff it and get a mostly alright picture at 16 or so hours in) the non-correct ones would stand out as ones that didn't fit with the pattern, and removable easily enough with non-conformity/noise reduction tools like you find in many picture editing suites.
In short, he'd basically be creating noise within the noise that was already there. To make this more effective, you'd change three or more pixels at once with only one being the correct one. This is more secure than replacing all the pixels at once because as you say you can monitor the ones which dont change anymore. Plus that would be stupidly computationally intensive.
There's no way to make it completely secure, but you can make it longer before whoever is trying to crack it successfully does so.
Wooo, very nice, looks like an Elite type space trading game based on the screens that are there, from left to right top to bottom:
1. In-station comms like on frontier (the thing I
thought was a railway bridge is a screen
showing a face, duh me!)
2. Loading/Selling cargo in a list, or possibly
viewing spaceship specs, some kind of textual
data anyway.
3. Hyperspace! (Got your towel?) and
4. Cockpit view
Just have to think what they'd call a game like that now...;)
Slashdot Mirror
But surely as long as the energy you're using to provide the electricity for electrolysis is renewable and freely available, it matters less?
As many have stated, hydrogen is just a portable energy transfer mechanism.
It is a less efficient method than rechargeable batteries in terms of how much energy is actually transferred, but you gain in terms of the equivalent weight/storage space, at least in theory.
A lot of people are complaining that most current hydrogen is sourced from hydrocarbons, etc. This is true, but it doesn't always have to be that way. Wind, tide and hydro-dam power is all harnessed (albeit on a small scale at the moment, but this may change) to produce electricity, and hydrogen can be obtained using electrolysis of water. Water will always be readily available, as using the hydrogen will combine with the oxygen in the atmosphere back into water, there is the infrastructure available to transport the hydrogen (at the moment transporting natural gas, but again probably convertible), and there is never a shortage of weather! My two pennies.
He's talking about changing only two random pixels out of the entire random bit field at a time, which is not as easily breakable but still can be done.
The difference would be, when there were plenty of pixels that had changed from the initial image (like there were when we were able to diff it and get a mostly alright picture at 16 or so hours in) the non-correct ones would stand out as ones that didn't fit with the pattern, and removable easily enough with non-conformity/noise reduction tools like you find in many picture editing suites.
In short, he'd basically be creating noise within the noise that was already there. To make this more effective, you'd change three or more pixels at once with only one being the correct one. This is more secure than replacing all the pixels at once because as you say you can monitor the ones which dont change anymore. Plus that would be stupidly computationally intensive.
There's no way to make it completely secure, but you can make it longer before whoever is trying to crack it successfully does so.
Wooo, very nice, looks like an Elite type space trading game based on the screens that are there, from left to right top to bottom: 1. In-station comms like on frontier (the thing I thought was a railway bridge is a screen showing a face, duh me!) 2. Loading/Selling cargo in a list, or possibly viewing spaceship specs, some kind of textual data anyway. 3. Hyperspace! (Got your towel?) and 4. Cockpit view Just have to think what they'd call a game like that now... ;)
The picture above the figure in a doorway looks like a rail bridge to me in this picture that I concocted from the bitstew: http://en.wikipedia.org/wiki/Image:Nibjib_file_for _lgp_competition.png