Panopticlick and Online Privacy

I prefer not to be tracked by ad-networks and other 'services' on the net and so far thought I was pretty much o.k. with having my cookies deleted whenever I end a browser session and having flash cookies disabled by default. But now it seems this is not quite the case.

Have a look over at the Electronic Frontier Foundation's (EFF) Panopticlick project and run the test yourself. By analyzing the user-agent information the web browser gives the web server when it connects together with additional information that can be queried and returned by JavaScript and Flash content embedded in a page, it is in most cases possible to uniquely identify you again. Yes, uniquely, as the combination of browser version, available fonts on the system, their reported order, time zone, screen size and a couple of other parameters generates such a wide range of combinations.

When running my browser as it is, my PC is identified as unique among 1.2 million devices already tested. If I activate No-Script to prevent JavaScript and Flash to execute on that page, the detection rate is down to 1:6815 devices. Still a shocking number. And if you add my German IP address into the mix in combination with the browsers language set to English, the whole thing probably blows up again.

Pretty solid research from the EFF and I hope we come up with some browser plug-ins soon that randomly change some of this information from time to time to protect my privacy.

Network Drive Testing

Every now and then I see in computer magazines or tech websites some network speed measurements (including my blog). Often, however, they are based on single measurement experience or maybe based on using a notebook in a few areas in the network. While this might be good for telling the performance in those places it doesn't really capture the overall capabilities of the networks. For this, so called drive tests are required and for comparisons between different networks, measurements must be performed in the different networks simultaneously. That's quite a challenge but the resulting data is well worth it. Here's a link to a recent article in a the German computer magazine "Chip" that has made an extensive test of the German networks. Google can help to translate the pages for those non-German speakers of you. Highly recommended for the background information and the interesting pictures of the measurement equipment and the results. If you know of similar tests having been published in other countries, please let me know!

The D-2 Story

D2 Most of us still remember in one way or another how the telecoms world looked like 25 years ago in Europe, North America and many other places around the world: State owned companies still controlled the voice telephony and data transmission market in many parts of the world and they had a monopoly for everything up to the last centimeter of the line, including the cable up to the actual telephone. Nobody but them touched any part of the network, there was no competition, and prices were in ranges that sound unbelievable compared to today. A lot has happened since then not only on the technology side that regularly spits out a new generation of equipment that is by orders of magnitude cheaper, faster, smaller, less power hungry, etc. But this is only one side of the medal. The other was privatization, i.e. the end of telecoms monopolies and regulation of telecom markets to ensure a fair and thriving competition between the former incumbents and those who've just entered the market.

A couple of weeks ago I wrote a post on this book on the inception and evolution of SMS which gives an interesting account not only on this topic but also how GSM as a whole was developed in the 1980s. While reading this book I remembered another book on the topic I read many years ago, “Die D-2 Story” (only available in German). Written in 1994, it gives an account of how the liberalization of the telecoms market in Germany started at the end of the 1980s by allowing and fostering a second GSM network operator next to the state owned incumbent. Reading the book is a sort of double history because Susanne Päch describes the events as seen in 1994. Now, over 15 years later, one can see what has changed since then and how the story continued, again from a technical and also a political point of view. Both histories, the one up to 1994 and the one afterwards are nothing but stunning. Here are some of the most outstanding events in those 25 years described in the book and also later on that I remember myself:

End of the 1980s: Germany decides to liberalize the telecoms market and start with mobile networks. The model for the process was the UK, where privatization started somewhat earlier.

A competition was launched to find the best private consortium. In the end, the winner was Mannesmann Mobilfunk (later bought by Vodafone), a consortium driven by the company of the same name but including many other companies. The book gives incredible details on the political situation and the developments inside the former incumbent, in the telecoms industry that developed the equipment and in the companies vying to win the second GSM license.

Getting from the state of the industry in the 1980s to today required many iterations. Even in 1994, when the book was written, the author could probably not have imagined how a fully liberalized telecoms market that we have today would look like. But I think that is not surprising. Just imagine how closed and nationalized the markets were prior to GSM. Here's an example: If you were one of those few thousand people who possessed an analog wireless telephone in the trunk of your car special actions had to be taken when crossing a national border. There may have been some exceptions, but by and large, the analog wireless phones could only be used in their country of origin. As radio waves don't stop at national borders some countries enforced deactivation by sealing the device and checking the seal on departure again. Others insisted that the owner attach a note at the device that it was forbidden by law to use the phone in their country. And yet others required the owner to pay a fee when they brought their phone in the trunk along. Those were the days… hardly imaginably today anymore when we already get upset if the phone needs a bit longer to find the network when it is first switched on in another country.

Prices both for fixed and mobile telephony slided significantly from then to now. Here's a recent post that looks at how prices have changed during the last 10 years.

While back in 1994, only mobile communication and microwave transmission to backhaul the traffic from the base station was liberalized, 1998 saw the liberalization of the complete telecoms market including voice and fixed line backhaul. Also by that time, four mobile network operators compete in the German market.

I could go on and on but suffice it to say that if you speak German and are interested in telecoms and its history, this book gives an incredibly interesting insight in those crucial years at the end of the 1980s to the first commercial availability of GSM by two network operators. As the book was written in 1994, it is no longer available from the publisher but you can easily find it on eBay and other sites that offer used books.

To close, here's a link that contains interesting information on the history of telecoms and wireless in Germany (again only in German) for a much longer period. Similar things like in Germany pretty much happened in all European countries in around the same time frame, give or take a couple of years. And yet, the differences made then still influence the markets today and the situation in the different countries is still diverse today. Compare Austria with France and then with the UK for example. Is anyone aware of similar books that describe the evolution of telecoms in other countries? I'd be highly interested to have a look!

3G Internet Access for 13 Euros in Italy

It's good to see that the number of prepaid SIM offers in many countries that can be used for 3G Internet access keeps going up and the Prepaid Wireless Internet Wiki keeps growing and information is constantly updated. Also, I keep noticing that prices are getting more competitive. For my two weeks of vacation in Italy this summer, for example, I used a SIM card from mobile operator WIND which I already used during previous trips and noticed that prices have further gone done. For my two week stay, the 1GB / month data option was quite sufficient which now only costs 9 Euros + a 4 Euro activation charge. For longer stays the 10 GB / month option for 20 euros might also be an alternative. Compare that to what some hotels charge for Wi-Fi per day…

Future Seamless Communication Conference at FOKUS

Ever since I first visited the Fraunhofer FOKUS institute almost exactly two years ago, I've remained in contact with the researchers there as they are working on interesting research projects in the wireless core network and IMS domain. Next month, on the 14th and 15th of October, they are hosting a follow up to their IMS conferences in the previous years called "Future Seamless Communication" or FUSECO for short. They've got a long list of interesting topics and speakers for their conference both from the industry and academia, something I always enjoy as both sides can learn a lot from each other. If you are interested in wireless core network topics it's definitely a conference not to be missed. Here's the link for a closer look. Enjoy!

Current Cell-PCH state in Italy

On of the shortcomings of current 3G networks compared to fixed line Internet connections is that to save power and network resources, most networks today put the connection into Idle state from which it takes considerable time (around 2.5-3 seconds) to come back into a fully active state. A solution for this is the Cell-PCH state from which the mobile can return into a more active state in less than a second. However, this state is not activated in many networks yet. For details on the topic see here, here and here. Lately, I have discovered that there are a number of live networks who have begun using Cell-PCH.

The latest example is Vodafone in Italy in some areas (e.g. in Rome, but not in Naples). While the other three networks in the country put the connection in Idle state after around 5-6 seconds in DCH state and around 30 seconds in Cell-FACH state, the Vodafone network puts the packet connection to my mobile into Cell-PCH state after having been in the fully active state for 5-6 seconds and 5-6 seconds in the Cell-FACH state afterwards. As my N95 does not support fast dormancy, I much prefer this behavior as my battery noticeably lasts longer and reaction times after reading a web page on the device for more than 30 seconds is much faster.

Still 3G IOT Roaming Issues

Back in 2006, UMTS was still a more or less new kid on the block and during my travels I often experienced interoperability issues with devices working well in their home network but not so well in other networks when traveling abroad. Here's an example. Things have considerably improved since then but still every now and then things go wrong. Here are some recent observations from Italy:

  • My now already somewhat old N95 just won't stay in the WIND network in manual selection mode. At some point it looses the network and miraculously reappears on the TIM network. I've never seen before that the device would just go to another network while in manual network selection mode. Definitely a first.
  • My default 7.2 Mbit/s 3G USB stick, which I would consider very stable in my German home network, every now and then completely looses the connection to the WIND network in Italy despite good network coverage and no movement and goes into network search mode. Quite incredible. Also it sometimes completely hangs and doesn't react anymore. Only a power cycle brings it back to live.
  • It seems the stick quite frequently has a problem to go from Idle to Cell-DCH state. In such cases, the stick tries for about 30 seconds to change the state before it succeeds and data flows again. Totally unacceptable. The only thing that helps is a constant ping which keeps the connection at least in Cell-FACH state.

Luckily I still have my somewhat old Huawei E-220 with me. Despite being a bit bulky and only HSDPA 3.6 Mbit/s capable (no HSUPA), this is the most stable piece of 3G hardware I ever had and it displays non of the issues described above.

Data Roaming Prices and Opera Mini Use In Europe

This year for the first time, data roaming prices in Europe are for the first time low enough for my mobile device Internet use, which is mostly Opera Mini and e-mail. With a still high price of around 2 Euros per megabyte, I wouldn't dare using it with a computer but for mobile browsing using compression and fine-tuned e-mail settings I use about 1 to 2 MB a day. That saves me the pain of carrying two devices simultaneously. Obviously for the notebook, I still prefer a local SIM card with a data option. But from a consumer point of view we are on a good way. I wonder how long it will take before I will dare using my home SIM card with a notebook, too!?

Wireless Vs. DSL in Italy

In the past couple of years I wrote a number of posts on how wireless Internet access for example via a 3G USB dongle will for some people be a good replacement for the DSL line at home (see here and here). During my recent stay in Italy I also found evidence of this there.

Two of my friends have each decided that a DSL line at home is too expensive and have given it up in favor of a 3G USB stick in one case and tethering the phone in the other case. As they are not heavy users, the amount of data included in their monthly option is more than enough for their use both at home and while underway. For heavy users and multi-member families with several devices at home that's not an option but for singles and single Internet connected device households its an interesting option to save money.