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The VID (VerkeersInformatieDienst), a private company in the Netherlands, uses Bluetooth signals to provide traffic information. To this end a network of thousands of road side sensors scan for Bluetooth signals emitted by smart phones, car radios etc. in passing cars. Each such Bluetooth device has unique MAC address that it regularly broadcasts. The sensors transmit that MAC address together with the time it was observed to a central server. Using this data, and matching MAC addresses observed at different sensors, this central server can estimate travel times and hence congestion. It turns out that VID stores the raw sensor data, and that law enforcement agencies in the Netherlands have used this data to link suspects to a crime scene.
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Apple recently updated its privacy policy, making clear that, unlike other companies (Hi, Google, Facebook,…!), in many cases it cannot or does not access your personal data. At the same time, in an open letter, its CEO Tim Cook states

Our business model is very straightforward: We sell great products. We don’t build a profile based on your email content or web browsing habits to sell to advertisers. We don’t “monetize” the information you store on your iPhone or in iCloud. And we don’t read your email or your messages to get information to market to you. Our software and services are designed to make our devices better. Plain and simple.

Even though I believe this is a very significant step, improving the privacy of ordinary users worldwide, it’s only a first step on a long trip to properly protect our privacy.

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I’m not only a computer scientist specialising in privacy enhancing technologies. I also enjoy playing music. In fact I play several instruments, among which the bassoon (which is quite a weird choice of instrument to play considering the music I like, but I digress…). Over the years I’ve compiled several fingering charts. Below you find the fingering charts for flageolet/dual tones.

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I’m not only a computer scientist specialising in privacy enhancing technologies. I also enjoy playing music. In fact I play several instruments, among which the bassoon (which is quite a weird choice of instrument to play considering the music I like, but I digress…). Over the years I’ve compiled several fingering charts. Below you find the fingering charts for the ‘normal’ tones.

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Yesterday my Adonit JOT Script finally arrived. I am a long time tablet user, stuck with Windows. I’ve always said I would switch to Apple if they would properly support the stylus, so I eagerly awaited this delivery. I am a bit disappointed however.

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People that know me know I’m a Tablet PC fan. I love to be able to annotate pdf’s by writing in the margins with a pen. And I really like One Note for writing down my meeting notes or research ideas. It’s great for math, flow charts, etc. It’s the only reason I still use Microsoft (if only Apple would …, but I digress). I recently got a Lenovo Helix. But I had huge problems with calibration of the pen. Here is how I solved it.

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Jumbo en Polare overwegen jou als klant in hun winkel te volgen met behulp van je eigen smartphone. Zo kunnen ze precies in kaart brengen hoe vaak je in de winkel komt, welke route je in de winkel volgt (loop je iedere keer langs de schappen met wijn?), en hoe lang je bij bepaalde producten stilstaat (twijfel je over de aanschaf van een bepaald tijdschrift?). Dit idee legt twee fundamentele problemen bloot.

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