Profile cover photo
Profile photo
Pierre-Olivier Dybman
2,296 followers -
Sidereo, expertise et créativité mobile
Sidereo, expertise et créativité mobile

2,296 followers
About
Posts

Post has attachment
Add a comment...

Post has shared content
And here comes the second part of "How to update Android devices using Barracks" by +Simon Guerout.
Add a comment...

Post has shared content
What will happen to your company if you are not able to update the IoT devices you're selling?

If you’re a B2C IoT company – with Christmas and the CES behind you – it’s maybe a slightly more relax time of the year since your best sales are done or on the way to be done.
Well, only if you have a good dedicated support team because most problems are now ahead and will appear as consumers receive your product.
Add a comment...

Post has shared content
** Update your devices with Barracks, get a free account today on https://barracks.io/ **

In the last 5 days, unprecedented attacks have been launched across the Internet. One of the targets, OVH, has been hit by a record breaking amount of traffic on its website more than 1100Gbps.

What made this company vulnerable? IoT devices!

Unsecured connected cameras have been used to generate a large amount of traffic to create a distributed denial of service (DDoS).

Letting your devices unmonitored and/or non up to date can damage others businesses and therefore make you legally responsible for it.
Barracks
Barracks
barracks.io
Add a comment...

Post has shared content

Post has shared content
Faraday cages are one of the most basic tools in electrical anything. They're based on the principle that if you place a hollow, conductive container inside an electromagnetic field, then no matter what that field is on the outside, the container shields it: inside the container, the field is zero. These also work in reverse: if you put a field source inside a conductive container, the container will prevent that field from getting out.

This is pretty useful if you want to do something that could produce dangerous fields, like use microwaves to heat food. By wrapping it in a Faraday cage, you make sure that the resulting fields don't also heat everything in their vicinity.

Now, most Faraday cages aren't solid, conductive containers; it's been known for a long time that a wire mesh works just as well. Except it turns out that it doesn't.

Faraday invented the cage in 1836. From then until roughly the 1940's, the correct functioning of mesh cages has been a combination of lore and practical engineering: if you really care that your cage works (like in a microwave oven), you build it and measure what happens. The theory of them was worked out by Feynman in the 1940's – except it turns out that Feynman simply did it wrong. (In particular, he looked at wire meshes with constant charge on them, not constant voltage; the math was right, it simply solved the wrong problem)

According to Feynman's solution, what matters for a working Faraday cage is the proximity of the wires. Roughly, the depth into the cage at which it provides the needed field suppression drops exponentially as the wires move closer together. It turns out this isn't right: fields decay only linearly with wire spacing. What really matters is the thickness of the wires: the suppression does scale exponentially with that.

In practice, this explains a lot of open mysteries, like why your cell phone works inside an elevator, but not inside an underground parking garage. Elevators, under the old theory, should have been pretty good Faraday cages; how do the radio signals, which are just EM fields, get out? It turns out they aren't very good Faraday cages at all. Likewise, garages don't tend to have deliberate EM shielding on them, but they do have lots of rebar, and windows which are often grated. Put those together and the new theory tells you that you have a great Faraday cage.

Also in practice, this team now has a good method for calculating how Faraday cages will actually work ahead of time. It's not rocket science; it's simply solving the differential equations of electrodynamics for a cage. You can see some of the results in pictures below, where the density of lines indicates the field strength. (In all of those pictures, an EM source is to the right of the cage)

The moral of this story: if everyone assumes that there's a good theory for something, but nobody can actually find it worked out in detail, there's a good chance that there actually isn't one.

Via +rone 
Add a comment...

Post has attachment
Add a comment...

Post has attachment
Add a comment...

Post has shared content
Dévs, designers... Humanoid organise un hackaton autour des chatbots. Un HTC Vive en jeu 👉 http://buff.ly/29pp3a4
Photo
Add a comment...

Post has shared content
I'm surprised it took me this long to notice it, but:

The #DAESH (IS, #ISIS, whatever you wanna call them) flag? It has an egregiously flagrant mistake (to Arab readers):

It says:
"الله رسول محمد "

Meaning "God, Mohammad's messenger".

That's so wrong on such a great level it's not even funny. Further more, it demonstrates that DAESH are not a Muslim group. Or probably even middle eastern, for that matter.

Because if they were, someone would have told them it's supposed to be:
"محمد رسول الله"

Or: "Mohammad, messenger of God".

As in: "There is no God but god, and Muhammad is the messenger of God"? You know, the core tenet of Islam? The one we pledge to? The one some people are presuming DAESH to be doing?

It's like whomever's actually behind DAESH hired the same team as Battlefield 3, who committed the same error of not verifying their translation before shipping their stupid, stupid crap.

If you needed any one tiny proof that DAESH is neither Muslim nor Arabic, this is pretty much what you need to look at.

Because the only people who firmly believe in the "God is Mohammad's messenger" narrative are reich-wing white supremacists.
Add a comment...
Wait while more posts are being loaded