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Iceland 2017


In summer 2017, my girlfriend and I traveled to Iceland for a camping / roadtrip / hiking / bathing / sightseeing vacation. Many friends were interested in our route and activities, so I am providing some details here. You can access my bookmarks and the approximate route (clockwise) from one of the following sources:

You can find some of our pictures here.

Weather. Iceland is for sure one of the most beautiful countries in this world. The weather is quite cold, wet, and windy and it can change very suddenly. However, please do not get frightened and just bring good equipment for every temperature and weather with you! The most important rule we learned in Iceland is to never postpone anything. If the floor is dry and it is not raining, put up your tent better sooner than later. If you have nice sunshine, do not stop with your planned trips - you might catch the best pictures of your trip very late in the evening. We made the experience that the weather might change every 10 minutes or every 5 kilometers. In a single hike to the airplane-wreck we were waiting for the rain to stop, started in bright sunshine, got into rain, got sunshine back. During returning it started hailing and raining with strong winds from the west so we got extactly 50 percent wet on one side only :-)

Car rental. We rented an Opel Astra from Sixt directly at the airport for 19 days for around 1160 € including "Vollkasko" (CDW) and unlimited kilometers. Anyhow, vulcanic ash damage (yes!), sand damage (during strong winds!), wind damage to doors, window damages, paint damages, underground damages, water damages, ... are not covered by this. If you want to be covered for this also, you need extra insurances which are very expensive (and you have to pay some part of the cost anyhow if something happens). It is very easy to get damages to your paint or to your windows as other vehicles often throw up stones which hit your car. The only defense is to slow down everytime you meet another car and avoid to leave the asphalted street (which is not always possible). To relieve the stress of driving during your vacation, I strongly recommend to book at least some additional insurance for the windshield. Make sure that you have enough money available for the deposit on exactly the creditcard you used for booking (may depend on the rental company)!

Road Conditions The roads on the Hringvegur ("Ringstraße") are very nicely prepared, much better than in Austria. But also on this road, there is one small part in the East where you have to go on unpaved roads. Side-trips are often unpaved, but the conditions of the unpaved roads are also very good. With "normal" cars, in Iceland you are not allowed to go on so-called "F"-roads which restricts your possibilities a little bit. There are also some additional routes which are banned for non-SUVs and even the SUVs need special labels to allow you to go on the "F" routes. Sometimes there are good reasons for these labels. We met some tourists who were going with a tourist-bus and their luggage was unvoluntarily washed when the bus went through a river. But, also without going on the "F"-Routes, there is more than enough to see in Iceland!

Alternatives (Biking / Hiking). We saw some people hitch-hiking or biking. The biggest issue is the weather, because you have no dry place to store your bags and you have to carry all equipment with you. Supermarkets are at large distances and you cannot always enjoy fresh food. Hitch-hiking is further difficult, because in some regions you meet cars very rarely. And if you are lucky and a car comes by, it is probably fully occupied with people and luggage. Biking is also not fun - the road is often dusty and not paved. Also, you will get very dirty in the rain. Cars don't slow down too much for you and might hit you with stones flying through the air. You need to protect against dust, stones, water, wind and cold. Sounds like an adventure? I warned you ;-)

Food. Despite Icelands very north location, you can buy almost everything in Iceland. However, you pay a lot for meat, vegetables or fruits. But that's nothing compared to the restaurants. Anyhow, I can recomment the "Islenski Barinn" in Reykjavik to try some traditional food! We payed 75€ for two main courses and one dessert and it was definetly worth it. However, we also saw a Pizza Margherita for 35 € ... Abroad, we prefered to cook our meals ourselves on our gas stove.

Costs. I get asked very often how much a vacation in Iceland costs. It's very expensive. It starts with the rental car, where you have to plan 60 - 300 € per day and continues with hotel prices starting with 100 € per night. Camping is a very cheap alternative - sometimes you find even a place to stay for a night for free. Gas prices are ok, you don't have too large distances, so it does not matter that much. But don't forget to include unlimited kilometers if you want to go around Iceland otherwise it becomes very expensive! You can spend much more on souveniers if you want to buy an original Icelandic pullover - they look nice but the wool is not really comfortable. As mentioned above, food is also very expensive. If you want to go out for dinner, be prepared. You can pay everywhere with your credit card - also on every camp-site in the middle of nowhere. Credit card is also accepted for very small amounts of money. We had some cash with us but we would have never needed it.

Approximate costs of a Iceland camping/road trip for 2 persons for 19 days (+1 day fly)
ItemApprox. Costs
Fly (VIE-KEF, Austrian)876 €
Train (Sparschiene)56 €
1x Airbnb (Reykjavik)70 €
Camping~300 €
Food~450 €
Gas (Diesel)~250 €
Opel Astra (19 Days)1160 €
Souveniers... €
Camping equipment... €
Entrance fees~500 €
Total~3700 € + ...

Hint: Camping Vehicles. If you can afford it, rent a small camping vehicle (e.g. from, GO Campers, Campervan Iceland, CampEasy ...). We saw a lot of them driving around and it is really nice because it makes you more independent from the weather compared to camping. You can still stay on camping sites spontaneously and don't have to arrange for fixed hotels upfront.

Travel Route & Highlights

USA 2016


In summer 2016, my girlfriend and I traveled to the western part of the United States to visit several national parks. As many friends were interested in our route and asked for hints, I am providing some details here. You can access the approximate route on Google Maps or download in KML format for a local viewer: (226 KiB).

San Francisco Golden Gate Bridge (from both sides!), Fisherman's Wharf, Painted Ladies, Cable Cars, Lombard Street, Coit Tower, Chinatown, Golden Gate Park (Japanese Garden)
Shoshone Falls Beautiful Waterfalls
Yellowstone National Park Geothermal activity, lots of very colorful hot springs, geysers, interesting geology, rich wildlife
Grand Teton National Park Lots of woods, big mountains, similar to Austria/Switzerland.
Goblin Valley State Park "Hoodoo rocks" aka goblins. Must see! Beautiful small campground. Visit the little wild horse canyon and the bell canyon!!!
Arches National Park Natural arches (Landscape Arch, Balanced Rock, Delicate Arch, Double Arch, Double O Arch, North window), nice hiking trips
Canyonlands National Park Short visit because of thunderstorms & wildfire :-(
National Bridges National Monument Some natural arches (similar to Arches National Park), Horsecollar ruin (disappointing from the distance)
Mesa Verde National Park World heritage site, must visit the Balcony House (guided tour only)
Monument Valley Navajo Nation Reservation, nice view from the campground (no cash accepted?!), dust-road is a must-do here.
Four Corners Navajo Nation Reservation, many tourist shops, 4x-corner between Colorado, Utah, Arizona, New Mexico
Grand Canyon National Park (North Rim) The view was a little disappointing, expected more from what I heard.
Bryce Canyon National Park Hoodoos, nice hiking trips through the area. Stay for the sunset/sunrise.
Zion National Park Nice view on the valley. Hiking recommended.
Valley of Fire State Park Very colorful rocks and nice hikes, "The Wave", nice campgrounds
Las Vegas Gambling city, visit at night
Death Valley National Park Zabriskie Point, Badwater Basin, Devils's Golf Course, extremely hot!
Joshua Tree National Park
Los Angeles Hollywood sign, Walk of Fame, Beverly Hills, Malibu Beach
Sequoia National Park Giant Sequoia Trees, Tunnel Tree, Crescent Meadow
Yosemite National Park Half Dome, Hiking tour to both waterfalls.
Pacific Coast / California Montery, Pacific Grove, Carmel-by-the-Sea
Natural Bridges State Beach Arch in the pacific ocean. Beautiful sunset.

Exciting Highlights of our Trip


Cryptoparty Graz


Im März durfte ich anlässlich des 2-jährigen Jubiläums einen "Gast­vortrag" bei der Crypto­party Graz halten. Thema war daher eine Ein­führung in die Gefahren des Inter­nets und die möglichen Gegen­maßnamen. Es gibt auch eine Video­aufzeichnung, die nun online ist (siehe Link).

Download: cryptoparty-2015-03-02.pdf (3698 KiB)
Video: Youtube

For my English readers: Sorry, this presentation was intended for locals in Graz - therefore it was held in German.

Defensio of my Master thesis


Am Donnerstag, den 22.01.2015 um 14:00 findet das Defensio meiner Masterarbeit statt. Das Thema meiner Arbeit lautet "Compiler-Assisted Integrity against Fault Injection Attacks".

"Fault Injection Attacks" sind physikal­ische Attacken, bei denen der Angreifer physische Kontrolle über das an­ge­griffene Gerät hat (z.B. Bankomat­karte, Reisepass, PayTV-Karte, SIM-Karte). Durch gezieltes Einschleusen von Speicher- oder Rechen­fehlern kann das Gerät ausgetrickst werden, sodass sich eine Zugangs­beschränkung entweder umgehen (z.B. PIN) lässt, oder dass ein Geheim­nis preis­gegeben wird (z.B. Passwort, Schlüssel). Meine Arbeit be­schäftigte sich mit Compiler-basierten (und damit Software-basierten) Gegen­maßnahmen gegen solche Angriffe. Nähere Details zur Arbeit gibt es nach der Prüfung.

Wo? HS FSI 2, Inffeldgasse 11, 8010 Graz (GPS: 47.0593311N, 15.464196E) [google] [OSM]

P.S.: Es handelt sich zwar um den Abschluss meines Telematik Master-Studiums, trotzdem erhalte ich danach noch den Titel Dipl.-Ing. [wiki].

Download my Master thesis


Nach meiner erfolgreichen Defensio am 22.01.2015 kann ich getrost meine Masterarbeit veröffentlichen. Ich darf mich noch einmal bei all jenen bedanken, die mich auf meinem Weg durch's Studium begleitet haben! Danke auch für das zahlreiche Erscheinen bei meiner Defensio und an Berni für den tollen Kuchen :-)

Master Thesis: Compiler-Assisted Integrity against Fault Injection Attacks


In 2014 I wrote my Master's Thesis on this topic at the IAIK (University of Technology Graz).

Abstract: Fault injection attacks are physical attacks against electronic devices where physical effects are used to manipulate data or signals. These attacks can bypass security mechanisms or unveil secret data which is processed by the device. Hardware- or software-based countermeasures can mitigate these attacks. While it is hard to modify pre-existing hardware, software-based countermeasures are more flexible. Software-based countermeasures can be applied to critical parts of the code which leads to less overhead. Applying software-based countermeasures manually is error-prone and complex. Hence, it is advantageous to use a compiler to apply these countermeasures automatically. Source code annotations can be used to distinguish important and unimportant code to keep the performance penalty to a minimum.

This work discusses compiler-assisted countermeasures against fault injection attacks. Since software-based countermeasures cannot prevent fault injection attacks, the aim is to detect them. Fault injection attacks can be detected by storing data redundantly and processing the data redundantly. From a theoretical standpoint, the following five different methods are discussed: checksums, simple duplication, complementary redundancy, masking, and verification of computations. Simple duplication and complementary redundancy were also practically realized using the LLVM compiler toolchain. Introducing redundancy to a compiler is a constant fight as the compiler aims at removing redundant code.

To verify the applied countermeasures, the effectiveness of the applied countermeasures was analyzed using a simulator of the ARM Cortex-M0+ which was extended to simulate fault injection attacks. Performing 829896 different bit-flip attacks to the unprotected test programs results in 64698 successful attacks (7.8 %). Simple duplication reduces the number of successful attacks to 328 of 1887768 attacks (0.0174%). Complementary redundancy reduces the number of possible attacks to 32 of 2285016 attacks (0.0014%). These promising results lay the foundation for further research in the field of compiler-assisted countermeasures against fault injection attacks.

Download Master's Thesis: masterthesis.pdf (768 KiB)

Bibtex: masterthesis.bib (1 KiB)

Upon request, I am providing the patches to the clang, the patches to the llvm, and my llvm passes here. Please note, that this project was developed as a proof-of-concept. It was never intended to be integrated into a final product.

View HTTP request headers


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