Slashdot Mirror


Encrypted Traffic No Longer Safe From Throttling

coderrr writes "New research could allow ISPs to selectively block or slow down your encrypted traffic even if they cannot snoop on your transmitted data. Italian researchers have found a way to categorize the type of traffic that is hidden inside an encrypted SSH session to around 90% accuracy. They are achieving this by analyzing packet sizes and inter-packet intervals instead of looking at the content itself. Challenges remain for ISPs to implement this technology, but it's clear that encrypting your traffic inside an SSH session or VPN connection is not a solution to protect net neutrality."

15 of 268 comments (clear)

  1. Why would they do it? by cephah · · Score: 5, Insightful

    Can anyone explain to me why any ISP would use this technique? If they start looking at packet sizes to determine different kinds of encrypted traffic then the packets will just be padded, causing their network to be further overloaded...

  2. Re:Correction... by KDR_11k · · Score: 5, Insightful

    Not really, they're providers of the medium and have no business limiting or snooping the datat that goes through their network especially since they were often granted a monopoly over building infrastructure in their area.

    --
    Justice is the sheep getting arrested while an impartial judge declares the vote void.
  3. Would have happened anyway. by zwei2stein · · Score: 4, Insightful

    Even without this analysis it was kinda obvious that throttle-happy ISPs would simply throttle all encrypted data once encrypting became mainstream in P2P.

    --
    -- Technology for the sake of technology is as pathetic as eschewing technology because it's technology.
    1. Re:Would have happened anyway. by CharlieHedlin · · Score: 4, Insightful

      What about VPN tunnels? People working from home are a core customer group they don't want to piss off.

    2. Re:Would have happened anyway. by thegnu · · Score: 5, Insightful

      those people will be more obliged to pay the ridiculously jacked up business internet prices, then, i suppose.

      --
      Please stop stalking me, bro.
  4. Look, this is a dead end. by Anonymous Coward · · Score: 5, Insightful

    You can identify the type of traffic, because we're not trying very hard to hide it. If you keep going down this road, we'll just send all the time, the same constant packet size, the same rate, regardless of actually required service. It's the same to us, really, because we pay a flat price. It is not the same to you, though, because when we have to make every traffic look the same, we'll use much more of your precious bandwidth, so cut out the crap.

  5. This will backfire by DarkOx · · Score: 5, Insightful

    All its going to do is encourage P2P developers to try (and they will likely succeed) to make P2P traffic look more like other traffic. Want your bittorent to look more like encrypted telnet? Easy send tons of tiny packets and take a short break every few seconds. All this is going to do is increase the packet overhead the ISPs see. That same overhead will also hurt P2P end users but unless its more then the throttle does they will do it anyone. Its a loose loose situation really. They ISPs should realize they gain nothing going down this path.

    --
    Repeal the 17th Amendment TODAY! Also Please Read http://www.gnu.org/philosophy/right-to-read.html
    1. Re:This will backfire by Brainix · · Score: 4, Insightful

      The ISPs will continue down this path until it is no longer economically feasible to do so. And that day *is* coming. One day, it'll be more expensive to play these cat-and-mouse games than to just give away cheap bandwidth, disk space, etc.

      --
      Raj Against the Machine! http://social-butterfly.appspot.com/
  6. Another Correction... by JustinOpinion · · Score: 5, Insightful

    How about:

    Not a solution to defeat ISPs attempts to control what's going through the government-funded, monopoly-protected, public-land-using network.

    You're right, facts do change the interpretation.

  7. Re:Correction... by DrJokepu · · Score: 4, Insightful

    Not a solution to defeat ISPs attempts to control, what's going through their network.

    Do you understand that ISPs are not exactly charity organizations, don't you? I am paying for their service and I expect it to work as it was advertised in their offer.

  8. Re:Correction... by Eivind · · Score: 5, Insightful

    If these policies where openly documented, and there where truly free competition, I'd agree with you; let the market sort it out.

    That typically isn't the case. First, these policies are rarely documented at all, and if they are, it's in language so vague as to make it useless for purposes of comparing one ISP to another. ("We may, at our discretion, at various times, perform adjustments to packet-priority")

    Free competition is also the exception rather than the rule. A huge fraction of end-user-lines where built by telcos acting as a government-granted monopoly, and then they somehow got to keep a large piece of this after the monopolies are no longer in principle monopolies. Which means in many areas they are still in -practice- pretty close to monopolies.

    And even where they're not, competition is low and that will remain so. Few people have more than 2, perhaps 3 physical cables coming in that are suitable for broadband. (many have a twisted-pair copper that used to be for POTS and a coax that used to be for analogue-cable, and that's it, extra bonus if the old monopolist owns the tv-cable in your area!)

    This ain't gonna change. A single modern cable has moder than enough capacity for all needs, so it's not economically sensible to have a large number of competitive cable-networks.

    Really, last-mile networks should be owned and run by the neighbourhoods, or failing that atleast be considered infrastructure, really today a working broadband-connection is basic infrastructure like electric power, water, sewage and roads. (it's not -equally- crucial as those, but it's crucial nevertheless, I doubt a house with -no- telecom-connection of any sort would find many buyers)

    Wireless changes the picture a bit, for low-bandwith applications. But only a bit. The problem is that the RF-spectrum is fundamentally shared, thus it will not be possible to deliver the same speeds and reliability as is possible on physical cable. (a single single-mode fibre easily supports speeds up atleast a Tbps or thereabouts which is more than most people need for the next few decades)

  9. Re:Correction... by Dr_Barnowl · · Score: 4, Insightful

    Not a solution to defeat ISPs attempts to control, what's going through networks they constructed with large sums of both public and private money they mortgaged against providing a service to their customers, not fighting against them.

    Yup, sure do.

  10. Re:Why bother? by TheLink · · Score: 5, Insightful

    That'll mess up corporate vpn users with clout, and https connections to banks etc.

    Anyway it doesn't take a genius to detect p2p.

    See the user. See the user after 1 hour. See how many bytes up and down. Check how many different IP destinations the user is connected with.

    If they are downloading a lot up and down, and connected to lots of host, chances are they are using P2P. Put them on a watch list. If they are still doing it much later, you put them on a black list where from then on if they are doing something similar you throttle them immediately (you can do it in a way that would in most cases still allow that user's web surfing to work reasonably - since most users don't websurf 20 different sites at the same time AND read those pages at the same time - it doesn't matter if pages come in one by one ).

    If they aren't downloading or uploading much, why throttle? :)

    No need for fancy math. No need for "deep packet inspection" or fancy "Dumb Investors Hand Over Your Money" phrases.

    Then again maybe I should write a "research" paper, mmm $$$$ ;).

    --
  11. Re:They can already throttle encrypted traffic. by Klaus_1250 · · Score: 4, Insightful

    There is another weakness in BT which allows ISP's to throttle traffic. Client to tracker communications. Unless your tracker uses SSL, all peers inside a swarm are send over in the clear. So your ISP knows which IPs are likely to send and receive BT-traffic. They don't have to look at the traffic, they just use the same information the tracker provided to you. IP in BT-swarm? Throttle.

    --
    It only takes one man to change the Wisdom of the Crowd to Tyranny of the Masses.
  12. Re:Why bother? by hairyfeet · · Score: 4, Insightful
    I personally wouldn't mind if they throttled down the speed to manage congestion,but of course congestion isn't what this is about.It is about giving you a really lousy cap and going tiered so they can make money off the same customer multiple times.I had a choice of 20Gb for $35(WISP) or 36Gb for $33(cable). I of course went cable. Now there is no way that Vonage will ever have me as a customer,since any VoIP other than the cableco's counts against my cap. And from what I understand Windows updates don't count against the cap which gives me and my customers one more reason not to use Linux.


    Mark my words,they are talking about congestion now,but if they kill off P2P and turn the country into a tiered network,you'll see us end up back with the walled gardens of AOL and Compuserve. Any videos except those hosted(and generating revenue for) your ISP will count against your cap. Any VoIP or other service that isn't run by(and generating money for) your ISP will count against your cap. And they will make the cap so low that unless all you do is surf websites(and you probably want to think about blocking those flash ads while you are at it) then you are going to smack into the cap,and get to pay $1 per Gb. Unless of course you stick with what the ISP offers you,which will of course not count against your cap. Instant lock in,just add congress critters to block that nasty net neutrality. But as always this is my 02c,YMMV

    --
    ACs don't waste your time replying, your posts are never seen by me.