davewiner's subscription list, hackerNewsStars category. List created by feedlandDatabase v0.8.16.
John D. Cook
• John
The latest issue of Paged Out! has an article by Stephen Hewitt “An off-line backup of your cryptographic key using playing cards.” The idea is to use a deck of 52 to store a 128-bit cryptographic key. To erase the key, shuffle the deck. Hewitt gives his algorithm for embedding a key, one that can […]
The post Hiding data in permutations first appeared on John D. Cook.
The Old New Thing
• Raymond Chen
Exception-safety, the invisible bug.
The post Making an agile version of a Windows Runtime delegate in C++/WinRT, part 6 appeared first on The Old New Thing.
Tedium: The Dull Side of the Internet.
• Ernie Smith
My brain-breaking trick for weaning off of Facebook involved creating a fake URL for Google News. Blame the home row.
John D. Cook
• John
My post from yesterday on permutation roots ends with a Mathematica code for finding the probability that a permutation of n elements has a kth root. This is done by finding the coefficient of xn in the generating function I wanted to say more about this, and look at implementing the same code in SymPy. […]
The post Counting permutations with roots first appeared on John D. Cook.
John D. Cook
• John
It’s well known that you can convert the base 16 (hex) representation of an integer to the base 2 (binary) representation by simply converting each digit from hex to binary. For example, CAFEhex = 1100 1010 1111 1110two I imagine it’s less well known that you can do the same thing with floating point numbers. […]
The post Printing floating point numbers in binary first appeared on John D. Cook.
Marcus on AI
• Gary Marcus
Nvidia is falling. The mood has changed.
The Silicon Underground
• Dave Farquhar
I’ve talked a lot about the advantages and disadvantages of old milestone operating systems. But what were the advantages and disadvantages of Windows NT 3.1, first released July 27, 1993? That’s a fair question, and there are valid reasons it
The post Advantages and disadvantages of Windows NT 3.1 appeared first on The Silicon Underground.
Pluralistic: Daily links from Cory Doctorow
• Cory Doctorow
Entropic Thoughts
• kqr
The Silicon Underground
• Dave Farquhar
ARCNET was the first commercially available local area network standard, beating both Ethernet and Token Ring to market. Conceptually, it had similarities with both, and because it was inexpensive and efficient, it was popular for a good 15 years or
The post What happened to ARCNET appeared first on The Silicon Underground.
John D. Cook
• John
Let σ be a permutation on n elements. If there is a permutation τ such that applying τ twice has the same effect on the list of elements as applying σ once, we say σ = τ² and τ is a square root of σ. If we let our n elements be the integers 0 […]
The post Permutation roots first appeared on John D. Cook.A couple weeks ago, the CEO of Snap was all over the news in the US because he and his wife made a large donation. The weird part about it was that every news outlet that covered it had an acrobatic title where they didn't specifically say how much they donated, yet insisted on that $550 Million amount.
When you read the article a bit deeper, you can do the math. They donated one hundredth of that amount. So I wondered, why did they inflate the amount in the first place? It looked like a PR stunt.
This past couple weeks, I worked on a video to explain what really happened and how we should take this news.
Enjoy
John D. Cook
• John
The function expq(x) is defined by taking the power series for exp(x) and keeping only the terms whose index is a multiple of q. For example, exp2(x) keeps only the even-numbered terms in the exponential power series and so equals cosh(x). In general, The first sum uses Iverson’s bracket notation: a Boolean expression in brackets […]
The post exp_q first appeared on John D. Cook.
Terence Eden’s Blog
• @edent
To call this derivative is an understatement. But that's what this genre demands; rehash all your favourite media properties into something new. It's the literary equivalent of having your Transformers™ fight your He-Man© toys. The plot, such as it is, features the Vogon Constructor Fleet destroying Earth due to a late beurecratic appeal, forcing people to play The Hunger Games, while a Twitch …
Troy Hunt
• Troy Hunt
The Origin Energy breach down here in Aus is all over the news this week, and as with many breaches, it's multi-faceted. You've got them leading with "don't worry, your credit card is fine", the hacker leading with "they didn&
