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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 Lawsuit Against Amazon: 'Subscribe and Save' Program Can Actually Cost You More
    by EditorDavid on 01/06/2026 at 7:34 am

    Amazon's "Subscribe & Save" program — for recurring purchasees — has triggered a new lawsuit, reports Oregon Live. "The lawsuit contends that after luring in customers with 'artificially low prices,' the world's biggest online retailer jacked up the prices in the months after their first shipments arrived." In some cases, the lawsuit claims that customers were paying more for the exact same items through the Subscribe & Save program than they would be if they bought the items from other sellers on the site. That was true even when the up to 15% discount that the subscription program offers was calculated into the final purchase price, according to the suit. The Seattle law firm that filed the May 15 lawsuit says that Amazon's business practices amount to "deceptive," "misleading" and "bait and switch tactics." The firm is seeking class-action status in U.S. District Court for western Washington, a move that could potentially draw tens of millions of Amazon customers from across the U.S. into the litigation... [The suit says the plaintiffs' first order of espresso coffee grounds was $16.60.] When their order auto-renewed a few months later, the price had gone up to $17.04. A few months later, it rose to $21.25. Then in October 2024, the price increased to $28.69 — about $12 more than the Hermans had paid at the beginning of their subscription, according to the lawsuit. [The discount can be as little as 5% or up to 15%, Amazon told Oregon Live in a statement, noting customers do receive an email showing "applicable savings" before the orders ship. But...] The suit says Amazon gave the Hermans little notice to cancel the order or to shop around because it notified them of the latest price increase in an email at 8:54 p.m. — the same night it processed their order and charged them. The suit says if the Hermans had been given the time to shop around for a better price, they would have found that another Amazon seller was charging $25.90 — or $2.79 less — for the identical item. Amazon's "Subscribe & Save Terms & Conditions" page tells customers that it "may change the price for a Subscribe & Save subscription at any time for any reason...." The analytical group Consumer Intelligence Research Partners says about 25% of U.S. Amazon customers are enrolled in the Subscribe & Save program. Oregon Live got Amazon's response, which suggested their program saves customers time and money "through convenient, flexible, and recurring deliveries". (So when customers saw "Subscribe and Save", they were perhaps supposed to intuit the word save referred in part to... time-saving?) The plaintiffs' lawyer argues instead that "When you sign up for something that is called 'Subscribe & Save,' you'd expect that you're saving by subscribing. But that's not actually what's happening in many cases." Read more of this story at Slashdot.

  • 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.

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