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A Nice Little Cryptography Primer

By itss | 28/06/2021
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Pun Intended.

Category: Technology
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  • New Desalination System Turns Seawater Into Drinking Water and Useful Salts - Including Lithium
    by EditorDavid on 01/06/2026 at 3:54 am

    "Scientists have developed a solar desalination system that turns seawater into drinking water without creating environmentally damaging brine," reports ScienceDaily. "Special laser-textured metal panels use sunlight to evaporate water while automatically moving salt deposits away from the working surface, preventing clogging. The process was successfully tested with water from three oceans and can recover nearly all salts as solids. Those leftover materials could even become a source of valuable lithium for batteries." (The research team was led by University of Rochest professor Chunlei Guo and published their results in the journal Light: Science & Applications.) The University of Rochester has made an announcement: The technology uses solar panels made of black metal etched with femtosecond lasers to make the surface super light-absorbing and superwicking — or extremely attractive to water. The panels have a laser-treated active region that pulls a thin layer of water across the surface, absorbs nearly all solar radiation, distills the water, and deposits the leftover salts and minerals into the panel's untreated sides or "passive" region so that the salt does not clog the active region and disrupt continuous desalination... Guo's team precisely etched the black metal's grooves so the various salts and minerals in ocean water would simply slough off... [I]t extracts nearly 100 percent of the salts in solid form. This could not only produce an abundant supply of table salt, but it could also be used to extract more precious minerals, including lithium, which is used in the lithium-ion batteries that power electric vehicles and other electronics. In a related paper in the Journal of Materials Chemistry A, Guo and his colleagues show how they can use the same superwicking solar panels to separate lithium from the rest of other salts in desalination. Embedding nanoparticles made of hydrogen titanate in the tiny grooves of the black metal surface isolates the lithium from other salts and minerals...Using water samples from Great Salt Lake, the researchers extracted about 50 percent of the lithium from the salts left behind by the desalination process. Guo says now that the superwicking desalination technology has been demonstrated in proofs of concept on small-scale devices, he sees the technology inherently scalable, capable of improving global access to drinking water and building more sustainable supply chains for precious minerals. "The National Science Foundation, the Bill & Melinda Gates Foundation, and Worldwide Universities Network supported this research." Read more of this story at Slashdot.

  • Something Made Earth's Molten Core Reverse Direction In 2010
    by EditorDavid on 01/06/2026 at 2:08 am

    ScienceAlert reports: In the molten ocean of iron churning in Earth's outer core, a section deep beneath the Pacific Ocean suddenly reversed direction and started moving eastward against the planet's usual westward flow. This happened in 2010, according to satellite measurements of Earth's magnetic field, and scientists are still trying to figure out what caused it... [I]t seemed to have a large, wave-like structure — as though a chunk of molten core material suddenly thought better of where it wanted to go, surging in the other direction... This finding suggests that there are processes that can influence it strongly enough to alter its behavior in bulk — and that our planet's interior may be more dynamic and variable than we thought. A new analysis captures what we know so far — and "It's from the roiling, molten, conducting metal at Earth's heart that the planetary magnetic field is generated... vital to our continued existence. It helps keep the atmosphere we breathe in and harmful cosmic radiation out." Read more of this story at Slashdot.

  • US, Australia, and UK Plan New Unmanned Vehicles to Protect Undersea Data Cables
    by EditorDavid on 01/06/2026 at 1:08 am

    "Around 570 cables (plus a further 80 planned) carry between 95% and 99% of the world's intercontinental telecommunications data," reports CNN (since fiber cables offer speeds of terabits per second, carry much more data than satellite links). And "networks of green energy cables carrying electricity are also starting to sprawl across the world's seabeds." Now to protect them, the U.S., Australia and the U.K. "are planning to develop new unmanned undersea vehicles" as part of their trilateral security partnership. Western governments see a growing risk of Russian and Chinese sabotage of undersea cables and are also concerned that Iran may seek to exploit the many data networks running through the shallow waters of the Persian Gulf. The "seabed is a battlefield" said Australia's Defence Minister, Richard Marles, in Singapore, calling for tougher action against so-called shadow-fleet vessels... The programme will improve the three nations' reconnaissance and strike capabilities, "and bolster superiority in anti-submarine and anti-surface warfare," as well as mine countermeasures, [according to a statement from their trilateral AUKUS partnership]... The new AUKUS project will sharpen all three countries' ability to respond to threats, including those targeting underwater cables and pipelines, through a range of "cutting edge sensors and weapons systems for undersea drones," UK Defence Secretary John Healey said. Marles said undersea internet cables — "the arteries of modern civilization" — were being cut at an unprecedented rate, with island nations like Australia acutely vulnerable. "Over the past 18 months, we have witnessed a series of attacks against subsea critical infrastructure at a scale and frequency that is historically unprecedented," he said. The UK government has also highlighted the vulnerability of the world's digital highways. "Every international payment, every cross-border trade executed in milliseconds, every flow of data between businesses here in the UK and markets overseas — all travel along the seabed," Telecoms Minister Liz Lloyd said Friday... Last month, the UK said it had tracked three Russian submarines covertly surveying undersea cables in the north Atlantic... A UK parliamentary inquiry warned last year that UK infrastructure might be targeted in a crisis, adding it was "not confident that the UK could prevent such attacks or recover within an acceptable time period." The UK Navy is already exploring the creation of a hybrid force that incorporates the widespread use of underwater drones to combat Russian threats in the Atlantic. Read more of this story at Slashdot.

  • 'The Oral Tradition That Built Software May Not Survive AI'
    by EditorDavid on 31/05/2026 at 10:15 pm

    A historian-turned-software engineer warns that "so little is ever written down" by professional programmers in a new article for Fast Company: Perhaps there's an early design doc, but then it turns out that everything was substantially revised before work began. Maybe there are a few wiki pages explaining known issues, some of which were solved a long time ago and others that have been left to molder in the codebase. Somebody might have left a comment in the code itself, but typically it's a warning not to change something or else something else will break... Software engineering has an ambivalent relationship with documentation. Everyone agrees documentation matters in theory, but in practice it's inconsistent, outdated, or missing entirely. Part of that is simple inertia. Writing documentation is usually less interesting than writing the code itself. But it's also ideological. The Agile movement emerged in part as a reaction against the heavily documented Waterfall methodology, and one of Agile's core values explicitly prioritizes "working software over comprehensive documentation." In escaping bureaucratic overdocumentation, the industry also normalized underdocumentation. High turnover at software jobs always brings "a constant drain of domain knowledge." And he's he's skeptical that generative AI will be able to fill in those gaps: [H]aving it generate documentation on the codebase itself might sound like a solution to the absence of other written information. LLMs can certainly summarize code back to you. But hold up with that idea. Beyond hallucinations, there's a deeper problem: Writing documentation is itself part of the thinking process. Whether I'm writing history or software, putting an approach into words helps refine it before I sink hours into implementation. Documentation also captures intent. An LLM may be able to summarize what a codebase does, but it cannot reliably explain why a developer chose one approach over another, or what trade-offs shaped that decision... An LLM can read code that I've written. It might even scan a large codebase and accurately summarize what it's doing. But it can't assess authorial intent. Thanks to long-time Slashdot reader smooth wombat for sharing the article. Read more of this story at Slashdot.

  • US Teachers' Union Urges Schools To Curb AI Chatbots and Screen Time
    by EditorDavid on 31/05/2026 at 9:15 pm

    Axios reports: The American Federation of Teachers, the second-largest teachers' union in the U.S., released a 10-point plan to introduce AI and screen-time guardrails in classrooms. The plan would limit AI use and ban screens for students in prekindergarten through second grade "unless there is a compelling reason," such as supporting students with special needs. The teacher union's president Randi Weingarten warned that young students "are drowning in tech," according to the New York Times, which reports the union president also "called on schools on Wednesday to stop giving digital devices like iPads to children in prekindergarten through second grade." In a speech at the National Press Club in Washington, Weingarten also urged elementary schools to avoid using artificial intelligence tools like OpenAI's ChatGPT, Google's Gemini and Khan Academy's Khanmigo with children [and] called for new national privacy and safety standards for A.I. tools in all schools... "The work of teaching and learning in the earliest grades should be done without A.I." The union's effort reflects a backlash among parents and educators against heavy use of school-issued laptops and apps. Some parents and nonprofit children's groups are also pushing back against campaigns by tech giants like Google and OpenAI to spread their A.I. products in schools... Weingarten said that the union was negotiating safety and privacy standards for A.I. use in schools with "our partners in the A.I. academy," and that Microsoft, OpenAI and Anthropic had agreed in principle to those standards. Weingarten "laid out a plan for reorienting public schooling toward human abilities and student well-being," according to the article, calling it "a devices down, eyes up, hands-on strategy." And meanwhile school cellphone bans are expanding into broader efforts to establish guardrails around AI in education and limit screen use, reports Axios. "At least 16 states — both red and blue — have introduced bills to limit classroom technology." Schools Beyond Screens formed with fewer than a dozen parents in Los Angeles Unified School District last year, but the nonprofit has grown to include thousands of parents and educators nationwide, SBS policy director Kate Brody tells Axios... McPherson Middle School principal Inge Esping told Axios that the suspension rate at her Kansas school fell 70% after cellphones were banned in 2022. Students also started speaking more with one another and with teachers. Thanks to long-time Slashdot reader theodp for sharing the article. Read more of this story at Slashdot.

  • New Star Wars Movie Falls to #3 Behind Two Movies Directed By YouTube Stars
    by EditorDavid on 31/05/2026 at 7:34 pm

    Disney's Star Wars: The Mandalorian and Grogu "suffered a catastrophic 70% drop in its second weekend," reports Variety, suggesting the movie isn't finding audiences "beyond an aging group of core fans." "Despite playing on far more screens, The Mandalorian and Grogu landed in third place on weekend charts behind Backrooms and Obsession." (described as "two buzzy horror films.") Suprisingly, both movies were directed by 20-something YouTube stars, "and cost nearly nothing to produce." Analyst Jeff Bock of Exhibitor Relations tells Variety, "We knew indie horror was hot, but we didn't know how hot. It's actually competing with the big summer blockbuster." Directed by 20-year-old Kane Parsons, "Backrooms" has earned $118 million globally so far... With a production budget of roughly $10 million, it's already one of the most profitable movies of the year. Though a sequel hasn't been announced, Parsons has already started toying with the idea of turning "Backrooms" into a film franchise... [The "Backrooms" premise seems to have originated on 4chan, then expanded in a YouTube video Parsons filmed when he was 16.] "Backrooms" also ranked as the biggest debut in history for original horror, as well as the best start for a first-time filmmaker on a non-franchise film. Parsons is the youngest director, by far, to have the No. 1 film at the box office. Based on Parsons' hit web series, "Backrooms" follows a furniture store owner (Chiwetel Ejiofor) who finds a secret doorway that leads him to a seemingly endless stretch of nondescript rooms. When he disappears, his therapist (Renate Reinsve) ventures into the unknown to rescue him. Nearly 85% of audiences were under the age of 35, and more than 50% were 25 or younger, according to PostTrak data. Parsons and [26-year-old Obsession director/writer Curry] Barker are part of a wave of YouTubers who have turned their talents to the big screen — and brought their enormous, youthful fanbases along with them. Earlier this year, YouTube creator Mark Fischback directed, self-financed and distributed the horror film "Iron Lung," which earned a stellar $50 million against a $3 million budget. What's all the more impressive is that "Backrooms" and "Obsession" aren't cannibalizing each other at the box office. In fact, "Obsession" rose 10% from the prior weekend, which was already up a stunning 39% from its solid $17 million debut. It's defying box office norms as the first film since "E.T. The Extraterrestrial" in 1982 to see ticket sales increase in its second and third weekends outside of the holiday season, according to Focus. After three weekends of release, "Obsession" has grossed $106 million domestically and $148 million worldwide against a mere $1 million production budget. The first-weekend box office for The Mandalorian and Grogu was the worst since 2002's Attack of the Clones, but then it's second-weekend drop in sales was also the largest ever, reports ScreenRant. The next-worst drop in sales (for a second weekend) was 2017's The Last Jedi, they point out, but The Last Jedi was dropping from a 2.5x larger debut. Their article suggests The Mandalorian/Grogu box office "may not ever hit a total large enough for the titular duo to return to the big screen," although it could eventually show a profit. "While it likely won't break even in theaters, it will earn additional revenue from merchandising on top of its impending streaming, video on demand, and physical media releases." Variety adds that Disney "is hoping that next summer's Star Wars: Starfighter, an original adventure directed by Shawn Levy and starring Ryan Gosling, serves as a fresh start for the franchise." Read more of this story at Slashdot.

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