Micropost

Ryan Seddon: So how does the browser actually render a website | JSConf EU 2015 » JSConf | youtube.com

La teoría del electromagnetismo viene codificada en cuatro ecuaciones, solo cuatro, las ecuaciones de Maxwell. Estas ecuaciones controlan todos los procesos electromagnéticos conocidos, todos, al menos a nivel clásico. Eso no está mal del todo porque el electromagnetismo es la piedra angular de nuestra tecnología y, de paso, de nuestra química. » cuentos-cuanticos.com

Fue a Bjarne Stroustrup a quién le leí que “un sistema grande y complejo que no ha evolucionado a partir de otro más simple que funcionaba bien, no funciona y, además, es imposible arreglarlo para que funcione” (creo que esto es del libro The Design and Evolution of C++ publicado en 1994). Tal hipótesis se comprobó empíricamente muchas veces en el siglo XX y es por eso que se cambió el foco a proyectos ágiles. ...

» Liz Fosslien and Mollie West | qz.com

In this notebook, we cover the basics of probability theory, and show how to implement the theory in Python. » Peter Norvig | nbviewer.ipython.org

Redis is advanced key-value cache and store, under BSD license. It is very fast, has many data types(String, Hash, List, Set, Sorted Set …), uses RDB or AOF persistence and replication to guarantee data security, and supplies many language client libraries. Most of all, market chooses Redis. There are many companies using Redis and it has proved its worth. Although redis is greate, it still has some disadvantages, and the biggest one is memory limitation. Redis keeps all data in memory, which limits the whole dataset size and lets us save more data impossibly. ...

We demonstrate the extraction of secret decryption keys from laptop computers, by nonintrusively measuring electromagnetic emanations for a few seconds from a distance of 50 cm. The attack can be executed using cheap and readily-available equipment: a consumer-grade radio receiver or a Software Defined Radio USB dongle. The setup is compact and can operate untethered; it can be easily concealed, e.g., inside pita bread. Common laptops, and popular implementations of RSA and ElGamal encryptions, are vulnerable to this attack, including those that implement the decryption using modern exponentiation algorithms such as sliding-window, or even its side-channel resistant variant, fixed-window (m-ary) exponentiation. We successfully extracted keys from laptops of various models running GnuPG (popular open source encryption software, implementing the OpenPGP standard), within a few seconds. The attack sends a few carefully-crafted ciphertexts, and when these are decrypted by the target computer, they trigger the occurrence of specially-structured values inside the decryption software. These special values cause observable fluctuations in the electromagnetic field surrounding the laptop, in a way that depends on the pattern of key bits (specifically, the key-bits window in the exponentiation routine). The secret key can be deduced from these fluctuations, through signal processing and cryptanalysis. ...

David D. Clark, an MIT scientist whose air of genial wisdom earned him the nickname “Albus Dumbledore,” can remember exactly when he grasped the Internet’s dark side. He was presiding over a meeting of network engineers when news broke that a dangerous computer worm — the first to spread widely — was slithering across the wires. One of the engineers, working for a leading computer company, piped up with a claim of responsibility for the security flaw that the worm was exploiting. “Damn,” he said. “I thought I had fixed that bug.” But as the attack raged in November 1988, crashing thousands of machines and causing millions of dollars in damage, it became clear that the failure went beyond a single man. The worm was using the Internet’s essential nature — fast, open and frictionless — to deliver malicious code along computer lines designed to carry harmless files or e-mails. ...

The evolution of the Unix operating system is made available as a version-control repository, covering the period from its inception in 1972 as a five thousand line kernel, to 2015 as a widely-used 26 million line system. The repository contains 659 thousand commits and 2306 merges. The repository employs the commonly used Git system for its storage, and is hosted on the popular GitHub archive. It has been created by synthesizing with custom software 24 snapshots of systems developed at Bell Labs, Berkeley University, and the 386BSD team, two legacy repositories, and the modern repository of the open source FreeBSD system. In total, 850 individual contributors are identified, the early ones through primary research. The data set can be used for empirical research in software engineering, information systems, and software archaeology. ...

There are just 32 pieces on a chessboard, but the number of patterns in which those pieces can move in the course of an individual game are astronomical. Still, as these maps show, despite all those different possibilities, each piece has a pretty clear pattern behind it. The maps, which track the most common trajectories of each chess piece, are the works of Steve Tung. Tung explained the process behind the maps to io9, noting that each map represents condensed data from over 2 million individual games of chess. ...