Menu

Search

Philipp Winter

Philipp Winter

Postdoctoral Research Associate in Computer Science, Princeton University

I am interested in computer networks and security, and why the two don't get along very well. I enjoy being part of all phases of a research project—from sketching ideas on a whiteboard, to implementation, and finally deployment and maintenance. To this end, I have worked in the three research areas listed below. I keep maintaining code I have developed in these research projects, so they are open-ended in some sense.

Keeping bad actors out of the Tor network
As communities grow in size, it becomes increasingly hard to keep out bad actors, and Tor is no exception because the network is run by volunteers. In 2013, I started developing exitmap, a fast and flexible scanner for Tor exit relays. If you have a background in functional programming, think about it as a map() interface for Tor exit relays. It allows you to run arbitrary, TCP-based tests over each exit relay. One of the main tasks of exitmap is to expose and block malicious and misbehaving exit relays. I recently broadened my scope to Sybil relays, sets of Tor relays that are under the control of a single entity. I am developing sybilhunter which is meant to assist in finding and analysing Sybils.

Censorship analysis
Early on in my Ph.D. studies, I became interested in the Great Firewall of China (GFW). I was first exposed to the GFW in 2011, when trying to understand how it blocks the Tor network. I have since revisited the topic several times, to understand how the GFW fails over space and time, and how its active probing component is designed. As part of my work on the Tor network, I also helped characterise—and circumvent—a censorship system in Ethiopia.

Traffic obfuscation
Motivated by my work on censorship systems, I became interested in traffic obfuscation, i.e., shaping network traffic in a way that it is hard to classify and block. I started by developing a small tool for server-side circumvention. It was designed to prevent the GFW from recognising Tor handshakes on the wire. The tool transparently rewrites the window size in a SYN-ACK segment, forcing the client to split its initial payload across two segment instead of one. Back in 2012, the GFW would not reassemble TCP streams, rendering it unable to spot circumvention traffic “protected” by this tool. I then went on and developed ScrambleSuit, a polymorphic traffic obfuscation protocol. ScrambleSuit can protect against the GFW's active probing attacks by relying on a “password” that is shared between client and server. ScrambleSuit has since been superseded by the faster and more elegant obfs4, which is no longer maintained by me.

Tor upgrades to make anonymous publishing safer

Mar 20, 2017 01:56 am UTC| Technology

In the coming months, the Seattle-based nonprofit The Tor Project will be making some changes to improve how the Tor network protects users privacy and security. The free network lets users browse the internet anonymously....

Securing web browsing: protecting the Tor network

May 18, 2016 08:28 am UTC| Insights & Views Technology

There are more than 865 encryption tools in use worldwide, all addressing different aspects of a common problem. People want to protect information: hard drives from oppressive governments, physical location from stalkers,...

1 

Economy

UK gilts slump after wage growth remains upbeat in August; investors await September retail sales

The UK gilts slumped Wednesday after the countrys wage growth remained upbeat during the month of August, adding to riskier sentiments among the investors. Further, investors now wait to watch the countrys retail sales for...

FxWirePro: UK unemployment report preview

The UK continues to suffer political trouble since the last election, where Prime Minister Theresa Mays Conservative Party fell short of an outright majority in the Parliament and is being forced to govern a minority...

EUR/PLN likely to witness further downside over near-term, says Commerzbank

The EUR/PLN currency pair is expected to witness further downside risks over the near-term, driven by concerns about accelerating inflation and possible rate hikes next year, according to the latest report from...

New Zealand bonds jump at close after dairy prices decline for second straight month

The New Zealand bonds jumped at the time of closing Wednesday after Global dairy prices slumped for the second time in a row at an auction held early on Wednesday, suggesting an earlier rally was running out of steam....

FxWirePro: The Day Ahead- 18th October 2017

Not many economic data and events scheduled for today but some with high volatility risks associated. Upcoming: Eurozone: ECB President Mario Draghi is set to deliver a speech at 8:10 GMT. August construction...

Politics

As China prepares for its Communist Party congress, what will it mean for the rest of the world?

Of Chinese President Xi Jinpings many achievements in his time in office about which much will be made in the official propaganda one of the most surprising was the more confident and assertive approach to foreign policy...

Las Vegas: the US is racked with impossible divisions over rights and freedoms

In the immediate aftermath of the October 2 Las Vegas massacre the USs 273rd mass shooting in 2017 alone it seems neither President Donald Trump nor his Republican colleagues will entertain a review of current gun...

Trump speaks at the UN: 5 takeaways

It is a short distance from Trump Tower on Fifth Avenue to the United Nations headquarters on First Avenue, but these are different worlds. Donald Trumps native world is one of unilateralism and competition, with more than...

Angela Merkel wins a fourth term in office – but it won't be an easy one

Angela Merkel will continue as chancellor of Germany. But following an election that saw the rise of smaller parties most notably the far right her fourth term will probably be an eventful one in ways she would not wish...

US under Trump Series: President Trump signs new travel ban with additional countries as old one expires

President Trump has signed a new executive order travel ban that was first initiated on the very first week after his inauguration and created quite a furore not only within the United States but around the world too. The...

Science

New Treatment For Blindness Gets FDA Panel Recommendation, First Of Its Kind

Providing hope to thousands of people suffering from hereditary blindness, advisers for the US Food and Drug Administration just gave a critical recommendation to a new type of treatment. Using gene therapy, the treatment...

VP Mike Pence Heads NASA’s Revived Moon Council, SpaceX To Do The Heavy Lifting

After months of hinting that a Lunar mission is in the works, US vice-president Mike Pence announced via The Wall Street Journal op-ed that NASA would be sending humans to the moon. The article was published just before...

Scientists Makes Hydrogen Fuel Production Cheaper With Seawater And New Nanomaterial

Solar and wind energy might be the renewable resources that are growing in popularity, but hydrogen fuel has proven to be incredibly reliable and powerful as well. Now, a University of Central Florida (UCF) scientist has...

Ikea Now Has Indoor Vertical Farm, Huge Potential For Solar Partnership

With the worlds climate constantly becoming hotter by the year, industries such as farming are going to experience massive problems such as drought and daylight heat thats too much for plants to handle. Thats why products...

Genome editing of human embryos broadens ethics discussions

For several years, scientists have experimented on human embryos with a powerful genome editing tool called CRISPR to see if they could correct genetic errors or reduce the risk of disease. In September, Kathy Niakan at...

Technology

EA Axes Yet Another Studio, Shuts Down Dead Space Developer

Entertainment Arts (EA) has earned a reputation for buying video game studios and ruining them, and it seems it has done it again. This time, the victim is Visceral Games, the studio behind the Dead Space series. EA just...

Google AI Creates Better AI Than What Humans Can Develop

Just to prove that practically no one is safe from being replaced by robots, Google recently revealed that its AutoML project has created another artificial intelligence thats even better than what humans can make. The...

CD Projekt Red Addresses Ex-Employee Complaints Alleging Mistreatment Of Workers

The Polish video game company CD Projekt Red is known for running the digital distribution platform GOG.com and producing the massively popular The Witcher franchise. However, rumors of poor working conditions and...

Google Photos Can Now Recognize Pets, Much Better For Sorting

Tech companies have been able to recognize humans faces for years but now, Google just revealed that it can now recognize pets. Through Google Photos, pictures of pets can automatically be tagged as either dog or cat and...

Netflix Revenue Could Exceed $11B, To Spend $8B On Original Content In 2018

The movie streaming mega giant Netflix is on track to exceed expectations with regards to its revenue by racking up $11 billion. This is largely being attributed to the growth of faster internet access and the spread of...
  • ET PRO
  • Market Data

Market-moving news and views, 24 hours a day >

October 18 14:30 UTC Released

BRForeign Exchange Flows*

Actual

1.261 Bln USD

Forecast

Previous

0.980 Bln USD

October 18 13:00 UTC Released

RUReal Wages YY

Actual

2.6 %

Forecast

3.9 %

Previous

3.7 %

October 18 23:50 UTC 33m

JPForeign Bond Investment

Actual

Forecast

Previous

89.2 Bln JPY

October 18 23:50 UTC 33m

JPForeign Invest JP Stock

Actual

Forecast

Previous

1235.3 Bln JPY

October 18 23:50 UTC 33m

JPExports YY*

Actual

Forecast

14.9 %

Previous

18.1 %

October 18 23:50 UTC 33m

JPImports YY*

Actual

Forecast

15.0 %

Previous

15.2 %

October 18 23:50 UTC 33m

JPTrade Balance Total Yen*

Actual

Forecast

559.8 Bln JPY

Previous

113.6 Bln JPY

October 19 00:00 UTC 1313m

KRBank of Korea Base Rate*

Actual

Forecast

Previous

1.25 %

October 19 00:00 UTC 1313m

ID7-Day Reverse Repo*

Actual

Forecast

4.25 %

Previous

4.25 %

October 19 00:00 UTC 1313m

IDDeposit Facility Rate*

Actual

Forecast

3.50 %

Previous

3.5 %

Close

Welcome to EconoTimes

Sign up for daily updates for the most important
stories unfolding in the global economy.