Does anyone know if SHA-512/256 produces the same digests as SHA256?  If so, the alleged efficiency might be interesting for CPU-miners on 64-bit platforms.

On Tuesday afternoon, as Secretary of State Hillary Rodham Clinton spoke in Washington about the Internet and human liberty, a Columbia law professor in Manhattan, Eben Moglen, was putting together a shopping list to rebuild the Internet — this time, without governments and big companies able to watch every twitch of our fingers.

The list begins with “cheap, small, low-power plug servers,” Mr. Moglen said. “A small device the size of a cellphone charger, running on a low-power chip. You plug it into the wall and forget about it.”

Almost anyone could have one of these tiny servers, which are now produced for limited purposes but could be adapted to a full range of Internet applications, he said.

“They will get very cheap, very quick,” Mr. Moglen said. “They’re $99; they will go to $69. Once everyone is getting them, they will cost $29.”

The missing ingredients are software packages, which are available at no cost but have to be made easy to use. “You would have a whole system with privacy and security built in for the civil world we are living in,” he said. “It stores everything you care about.”

Put free software into the little plug server in the wall, and you would have a Freedom Box that would decentralize information and power, Mr. Moglen said. This month, he created the Freedom Box Foundation to organize the software.

“We have to aim our engineering more directly at politics now,” he said. “What has happened in Egypt is enormously inspiring, but the Egyptian state was late to the attempt to control the Net and not ready to be as remorseless as it could have been.”

Not many law professors have Mr. Moglen’s credentials as lawyer and geek, or, for that matter, his record as an early advocate for what looked like very long shots.

Growing up on the West Side of Manhattan, he began fooling around with computers as a boy. In 1973, at age 14, he was employed writing programs for the Scientific Time Sharing Corporation. At 26, he was a young lawyer, clerking for Justice Thurgood Marshall. Later, he got a Ph.D. in history from Yale. He was also the lawyer for the Free Software Foundation, headed by Richard M. Stallman, which aggressively — and successfully — protected the ability of computer scientists, hackers and hobbyists to build software that was not tied up by copyright, licensing and patents.

In the first days of the personal computer era, many scoffed at the idea that free software could have an important place in the modern world. Today, it is the digital genome for millions of phones, printers, cameras, MP3 players, televisions, the Pentagon, the New York Stock Exchange and the computers that underpin Google’s empire.

This month, Mr. Moglen, who now runs the Software Freedom Law Center, spoke to a convention of 2,000 free-software programmers in Brussels, urging them to get to work on the Freedom Box.

Social networking has changed the balance of political power, he said, “but everything we know about technology tells us that the current forms of social network communication, despite their enormous current value for politics, are also intensely dangerous to use. They are too centralized; they are too vulnerable to state retaliation and control.”

In January, investors were said to have put a value of about $50 billion on Facebook, the social network founded by Mark Zuckerberg. If revolutions for freedom rest on the shoulders of Facebook, Mr. Moglen said, the revolutionaries will have to count on individuals who have huge stakes in keeping the powerful happy.

“It is not hard, when everybody is just in one big database controlled by Mr. Zuckerberg, to decapitate a revolution by sending an order to Mr. Zuckerberg that he cannot afford to refuse,” Mr. Moglen said.

By contrast, with tens of thousands of individual encrypted servers, there would be no one place where a repressive government could find out who was publishing or reading “subversive” material.

In response to Mr. Moglen’s call for help, a group of developers working in a free operating system called Debian have started to organize Freedom Box software. Four students from New York University who heard a talk by Mr. Moglen last year have been building a decentralized social network called Diaspora.

Mr. Moglen said that if he could raise “slightly north of $500,000,” Freedom Box 1.0 would be ready in one year.

“We should make this far better for the people trying to make change than for the people trying to make oppression,” Mr. Moglen said. “Being connected works."

I wonder if there's some way to discourage that kind of anti-social behavior; could the network detect that was being done and "shun" that miner's blocks?