a topic on the math version of stackoverflow, filled with funny stories, anecdotes, urban legends about mathematicians. If you're like me you're gonna love every bit of it.
Although David Hilbert was one of the first to deal seriously with infinite-dimensional complete inner product spaces, the practice of calling them after him was begun by others, supposedly without his knowledge. The story goes that one day a visitor came to Göttingen and gave a seminar about some theorem on "Hilbert spaces". At the end of the lecture, Hilbert raised his hand and asked, "What is a Hilbert space?"
When the logician Carnap was immigrating to the US, he had the usual consular interview, where one of the questions was (and still is, I think): "Would you favor the overthrow of the US government by violence, or force of arms?". He thought for a while, and responded: "I would have to say force of arms..."
Just a few weeks after Silk Road 2.0 and its owner got seized, the US government posted this:
THIS SEALED BID AUCTION IS FOR A PORTION OF THE BITCOINS CONTAINED IN WALLET FILES THAT RESIDED ON CERTAIN COMPUTER HARDWARE BELONGING TO ROSS WILLIAM ULBRICHT, THAT WERE SEIZED ON OR ABOUT OCTOBER 24, 2013 (“COMPUTER HARDWARE BITCOINS”).
Apparently it's from the first Silk Road. Pretty comical.
Ever fiddled with your TI-8x or played LineRider? Well this guy combined both and it looks awesome!
the game is here: http://sineridergame.com/
Scott Aaronson found a 1994 issue of Cryptolog an internal newsletter at the NSA. He's quoting funny extracts from one of its article about a field trip at the 1992 Eurocrypt Conference.
Those of you who know my prejudice against the “zero-knowledge” wing of the philosophical camp will be surprised to hear that I enjoyed the three talks of the session better than any of that ilk that I had previously endured. The reason is simple: I took along some interesting reading material and ignored the speakers. That technique served to advantage again for three more snoozers, Thursday’s “digital signature and electronic cash” session, but the final session, also on complexity theory, provided some sensible listening.
more on his blog: http://www.scottaaronson.com/blog/?p=2059
The next Hack Summit will happen entirely online and will start on December the 1st.
You can get a free ticket by posting it on twitter/facebook.
An amazing line up of people will be giving talks: David Heinemeier Hansson (creator of Ruby on Rails), Tom Chi (creator of Google Glass), Hakon Wium Le (creator of CSS), Bram Cohen (creator of Bittorrent), Brian Fox (creator of Bash), Hampton Catlin (creator of Sass and Haml), and many more interesting persons and even....... Jon Skeet (#1 answerer on StackOverflow). This is gonna be huge!
I was wondering why Randomized Algorithm were often more efficient than non-randomized algorithm.
Then I looked at a list of random number generators (or RNG).
Of course we usually talk about PRNG (Pseudo Random Number Generator) since "truly random" is impossible/hard to achieve.
An interesting thing I stumbled into is that you can create a PRNG using a block cipher in counter mode, by iterating the counter and always encrypting the same thing, if the block cipher used is good, it should look random.
This sounds solid since ciphers sometimes need to have Ciphertext Indistinguishability from random noise.
To support such deniable encryption systems, a few cryptographic algorithms are specifically designed to make ciphertext messages indistinguishable from random bit strings
Also under the Ciphertext indistinguishability property that a cipher should respect, you shouldn't be able to find any relations between the ciphertexts coming from the same input but encrypted with an increasing counter.
MicroCorruption is a "game" made by Matasano in which you will have to debug some programs in assembly. There is a total of 19 levels and it gets harder and harder by the number. The first levels are made for beginners though! So it seems like a great tool to learn, and that's what our prof Emmanuel Fleury must have thought when he gave us this as homework. One rule: every level is worth one point.
I started writing the solutions here but as people told me "it was unethical to post solutions of a challenge online", I promptly removed them. If someday the challenge will shut down I will post the write ups online so that people can still learn from it :)
The Sapheads team draw a comic as a write up for the finale of the Defcon CTF in 2009. Since it's a classic here it is