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November 09 2017

3we

How Cloudflare Uses Lava Lamps To Encrypt the Internet

YouTuber Tom Scott was invited to visit Cloudflare's San Francisco headquarters to check out the company's wall of lava lamps. These decorative novelty items -- while neat to look at -- serve a special purpose for the internet security company. Cloudflare takes pictures and video of the lava lamps to turn them into "a stream of random, unpredictable bytes," which is used to help create the keys that encrypt the traffic that flow through Cloudflare's network. ZDNet reports:

Cloudflare is a DNS service which also offers distributed denial-of-service (DDoS) attack protection, security, free SSL, encryption, and domain name services. Cloudflare is known for providing good standards of encryption, but it seems the secret is out -- this reputation is built in part on lava lamps. Roughly 10 percent of the Internet's traffic passes through Cloudflare, and as the firm deals with so much encrypted traffic, many random numbers are required. According to Nick Sullivan, Cloudfare's head of cryptography, this is where the lava lamps shine. Instead of relying on code to generate these numbers for cryptographic purposes, the lava lamps and the random lights, swirling blobs and movements are recorded and photographs are taken. The information is then fed into a data center and Linux kernels which then seed random number generators used to create keys to encrypt traffic. "Every time you take a picture with a camera there's going to be some sort of static, some sort of noise," Sullivan said. "So it's not only just where the bubbles are flowing through the lava lamp; it is the state of the air, the ambient light -- every tiny change impacts the stream of data."
Cloudflare also reportedly uses a "chaotic pendulum" in its London office to generate randomness, and in Singapore, they use a radioactive source.
3we

Umweltbundesamt-Chefin fordert streckenabhängige Straßenmaut

Die Präsidentin des Umweltbundesamtes, Maria Krautzberger, wirbt dafür, das Autofahren im Sinne des Klimaschutzes "insgesamt zu reduzieren". Einen Beitrag dazu könnte eine umfassende Straßennutzungsgebühr leisten.

3we

How Facebook Figures Out Everyone You've Ever Met

"I deleted Facebook after it recommended as People You May Know a man who was defense counsel on one of my cases. We had only communicated through my work email, which is not connected to my Facebook, which convinced me Facebook was scanning my work email," an attorney told Gizmodo. Kashmir Hill, a reporter at the news outlet, who recently documented how Facebook figured out a connection between her and a family member she did not know existed, shares several more instances others have reported and explains how Facebook gathers information. She reports:

Behind the Facebook profile you've built for yourself is another one, a shadow profile, built from the inboxes and smartphones of other Facebook users. Contact information you've never given the network gets associated with your account, making it easier for Facebook to more completely map your social connections. Because shadow-profile connections happen inside Facebook's algorithmic black box, people can't see how deep the data-mining of their lives truly is, until an uncanny recommendation pops up. Facebook isn't scanning the work email of the attorney above. But it likely has her work email address on file, even if she never gave it to Facebook herself.

...[weiter]...

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