Tagging and Location Technologies
Interesting speculative article.
Entries Tagged "concealment"
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New Report on Teens, Social Media, and Privacy
Interesting report from the From the Pew Internet and American Life Project:
Teens are sharing more information about themselves on their social media profiles than they did when we last surveyed in 2006:
- 91% post a photo of themselves, up from 79% in 2006.
- 71% post their school name, up from 49%.
- 71% post the city or town where they live, up from 61%.
- 53% post their email address, up from 29%.
- 20% post their cell phone number, up from 2%.
60% of teen Facebook users set their Facebook profiles to private (friends only), and most report high levels of confidence in their ability to manage their settings.
danah boyd points out something interesting in the data:
My favorite finding of Pew’s is that 58% of teens cloak their messages either through inside jokes or other obscure references, with more older teens (62%) engaging in this practice than younger teens (46%)….
While adults are often anxious about shared data that might be used by government agencies, advertisers, or evil older men, teens are much more attentive to those who hold immediate power over them—parents, teachers, college admissions officers, army recruiters, etc. To adults, services like Facebook that may seem “private” because you can use privacy tools, but they don’t feel that way to youth who feel like their privacy is invaded on a daily basis. (This, btw, is part of why teens feel like Twitter is more intimate than Facebook. And why you see data like Pew’s that show that teens on Facebook have, on average 300 friends while, on Twitter, they have 79 friends.) Most teens aren’t worried about strangers; they’re worried about getting in trouble.
Over the last few years, I’ve watched as teens have given up on controlling access to content. It’s too hard, too frustrating, and technology simply can’t fix the power issues. Instead, what they’ve been doing is focusing on controlling access to meaning. A comment might look like it means one thing, when in fact it means something quite different. By cloaking their accessible content, teens reclaim power over those who they know who are surveilling them. This practice is still only really emerging en masse, so I was delighted that Pew could put numbers to it. I should note that, as Instagram grows, I’m seeing more and more of this. A picture of a donut may not be about a donut. While adults worry about how teens’ demographic data might be used, teens are becoming much more savvy at finding ways to encode their content and achieve privacy in public.
The Nemim.gen Trojan
This clever piece of malware evades forensic examination by deleting its own components.
Friday Squid Blogging: Mimicking Squid Camouflage
Cephalopods – squid, cuttlefish and octopuses – change colour by using tiny muscles in their skins to stretch out small sacs of black colouration.
These sacs are located in the animal’s skin cells, and when a cell is ready to change colour, the brain sends a signal to the muscles and they contract.
This makes the sacs expand and creates the optical effect which makes the animal look like it is changing colour.
[…]
To mimic these natural mechanisms, the team used “smart” electro-active polymeric materials, connected to an electric circuit.
When a voltage was applied, the materials contracted; they returned to their original shape when they were short-circuited.
“These artificial muscles can replicate the [natural] muscular action… and can have strong visual effects,” said Dr Rossiter.
“These materials, and this approach, is ideal for making smart colour-changing skins or soft devices in which fluid is pumped from one place to another.
As usual, you can also use this squid post to talk about the security stories in the news that I haven’t covered.
Tampon-Shaped USB Drive
This vendor is selling a tampon-shaped USB drive. Although it’s less secure now that there are blog posts about it.
Disguising Tor Traffic as Skype Video Calls
One of the problems with Tor traffic is that it can de detected and blocked. Here’s SkypeMorph, a clever system that disguises Tor traffic as Skype video traffic.
To prevent the Tor traffic from being recognized by anyone analyzing the network flow, SkypeMorph uses what’s known as traffic shaping to convert Tor packets into User Datagram Protocol packets, as used by Skype. The traffic shaping also mimics the sizes and timings of packets produced by normal Skype video conversations. As a result, outsiders observing the traffic between the end user and the bridge see data that looks identical to a Skype video conversation.
The SkypeMorph developers chose Skype because the software is widely used throughout the world, making it hard for governments to block it without arousing widespread criticism. The developers picked the VoIP client’s video functions because its flow of packets more closely resembles Tor traffic. Voice communications, by contrast, show long pauses in transmissions, as one party speaks and the other listens.
Covert Communications Channel in Tarsiers
Marissa A. Ramsier, Andrew J. Cunningham, Gillian L. Moritz, James J. Finneran, Cathy V. Williams, Perry S. Ong, Sharon L. Gursky-Doyen, and Nathaniel J. Dominy (2012), “Primate communication in the pure ultrasound,” Biology Letters.
Abstract: Few mammals—cetaceans, domestic cats and select bats and rodents—can send and receive vocal signals contained within the ultrasonic domain, or pure ultrasound (greater than 20 kHz). Here, we use the auditory brainstem response (ABR) method to demonstrate that a species of nocturnal primate, the Philippine tarsier (Tarsius syrichta), has a high-frequency limit of auditory sensitivity of ca 91 kHz. We also recorded a vocalization with a dominant frequency of 70 kHz. Such values are among the highest recorded for any terrestrial mammal, and a relatively extreme example of ultrasonic communication. For Philippine tarsiers, ultrasonic vocalizations might represent a private channel of communication that subverts detection by predators, prey and competitors, enhances energetic efficiency, or improves detection against low-frequency background noise.
Friday Squid Blogging: Squid Camouflage
Some squid can switch their camouflage instantly.
As usual, you can also use this squid post to talk about the security stories in the news that I haven’t covered.
Secret Codes in Bacteria
Neat:
Researchers have invented a new form of secret messaging using bacteria that make glowing proteins only under certain conditions. In addition to being useful to spies, the new technique could also allow companies to encode secret identifiers into crops, seeds, or other living commodities.
[…]
The new scheme replaces the fuse with seven colonies of Escherichia coli bacteria, each given a gene for a different fluorescent protein. When, and only when, these genes are turned on do the bacteria make these proteins and light up. The colors, including yellow, green, and red, vary based on which gene is expressed. All are clearly visibly different to the naked eye. With their colorful bacterial colonies in hand, the researchers then created a code using pairs of different colored bacteria. Having seven colors gave them 49 combinations, which they used to encode the 26 different letters and 23 alphanumeric symbols such as “@” and “$.” They wrote a message by simply blotting pairs of colored bacteria in rows. To “print” the message, the researchers transferred the bacteria onto a plate containing agar, a bacterial growth medium, into which they pressed a sheet of nitrocellulose “paper” that immobilizes the bacteria.
At this point, the bacteria on the nitrocellulose paper remain invisible. But the message receiver can turn on the key genes and make the colors light up by pressing the nitrocellulose paper into an agar plate containing a chemical trigger that activates expression of the fluorescent proteins. (The proteins chosen to light up are ones the bacteria don’t normally use, so unless the researchers activate them, they stay quiescent.) As long as the receiver knows which colors correspond to which characters, the message is revealed. But Walt and his colleagues added one more safeguard as well. Into some bacteria they inserted genes for resistance to particular antibiotics; the idea is that only the antibiotic-resistant bacteria are carrying the real message. If the message fell into the wrong hands, the receiver would see a mix of colors once the genes were activated and be unable to read it. But if the decoder added the right antibiotic, nonresistant bacteria and their colors die away, and the message becomes clear. The first example, reported in today’s issue of the Proceedings of the National Academy of Sciences reads “this is a bioencoded message from the walt lab @ tufts university 2010.”
The U.S. Seems to Have a Secret Stealth Helicopter
That’s what the U.S. destroyed after a malfunction in Pakistan during the bin Laden assassination. (For helicopters, “stealth” is less concerned with radar signatures and more concerned with acoustical quiet.)
There was some talk about Pakistan sending it to China, but they’re returning it to the U.S. I presume that the Chinese got everything they needed quickly.
Sidebar photo of Bruce Schneier by Joe MacInnis.