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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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  • Homeschooling Hits Record Numbers
    by msmash on 21/11/2025 at 2:00 pm

    An anonymous reader shares a report: "In the 2024-2025 school year, homeschooling continued to grow across the United States, increasing at an average rate of 5.4%," Angela Watson of the Johns Hopkins University School of Education's Homeschool Hub wrote earlier this month. "This is nearly three times the pre-pandemic homeschooling growth rate of around 2%." She added that more than a third of the states from which data is available report their highest homeschooling numbers ever, even exceeding the peaks reached when many public and private schools were closed during the pandemic. After COVID-19 public health measures were suspended, there was a brief drop in homeschooling as parents and families returned to old habits. That didn't last long. Homeschooling began surging again in the 2023-2024 school year, with that growth continuing last year. Based on numbers from 22 states (not all states have released data, and many don't track homeschoolers), four report declines in the ranks of homeschooled children -- Delaware, the District of Columbia, Hawaii, and Tennessee -- while the others report growth from around 1 percent (Florida and Louisiana) to as high as 21.5 percent (South Carolina). The latest figures likely underestimate growth in homeschooling since not all DIY families abide by registration requirements where they exist, and because families who use the portable funding available through increasingly popular Education Savings Accounts to pay for homeschooling costs are not counted as homeschoolers in several states, Florida included. As a result, adds Watson, "we consider these counts as the minimum number of homeschooled students in each state." Read more of this story at Slashdot.

  • HP and Dell Disable HEVC Support Built Into Their Laptops' CPUs
    by BeauHD on 21/11/2025 at 1:00 pm

    An anonymous reader quotes a report from Ars Technica: Some Dell and HP laptop owners have been befuddled by their machines' inability to play HEVC/H.265 content in web browsers, despite their machines' processors having integrated decoding support. Laptops with sixth-generation Intel Core and later processors have built-in hardware support for HEVC decoding and encoding. AMD has made laptop chips supporting the codec since 2015. However, both Dell and HP have disabled this feature on some of their popular business notebooks. HP discloses this in the data sheets for its affected laptops, which include the HP ProBook 460 G11 [PDF], ProBook 465 G11 [PDF], and EliteBook 665 G11 [PDF]. "Hardware acceleration for CODEC H.265/HEVC (High Efficiency Video Coding) is disabled on this platform," the note reads. Despite this notice, it can still be jarring to see a modern laptop's web browser eternally load videos that play easily in media players. HP and Dell didn't explain why the companies disabled HEVC hardware decoding on their laptops' processors. A statement from an HP spokesperson said: "In 2024, HP disabled the HEVC (H.265) codec hardware on select devices, including the 600 Series G11, 400 Series G11, and 200 Series G9 products. Customers requiring the ability to encode or decode HEVC content on one of the impacted models can utilize licensed third-party software solutions that include HEVC support. Check with your preferred video player for HEVC software support." Dell's media relations team shared a similar statement: "HEVC video playback is available on Dell's premium systems and in select standard models equipped with hardware or software, such as integrated 4K displays, discrete graphics cards, Dolby Vision, or Cyberlink BluRay software. On other standard and base systems, HEVC playback is not included, but users can access HEVC content by purchasing an affordable third-party app from the Microsoft Store. For the best experience with high-resolution content, customers are encouraged to select systems designed for 4K or high-performance needs." Read more of this story at Slashdot.

  • CERN Can Now Produce Antihydrogen Atoms Eight Times Faster Than Before
    by BeauHD on 21/11/2025 at 10:00 am

    fahrbot-bot shares a report from Phys.org: Physicists from Swansea University have played the leading role in a scientific breakthrough at CERN, developing an innovative technique that increases the antihydrogen trapping rate by a factor of ten. The advancement, achieved as part of the international Antihydrogen Laser Physics Apparatus (ALPHA) collaboration, has been published in Nature Communications and could help answer one of the biggest questions in physics: Why is there such a large imbalance between matter and antimatter? According to the Big Bang theory, equal amounts were created at the beginning of the universe, so why is the world around us made almost entirely of matter? Antihydrogen is the "mirror version" of hydrogen, made from an antiproton and a positron. Trapping and studying it helps scientists explore how antimatter behaves, and whether it follows the same rules as matter. Producing and trapping antihydrogen is an extremely complicated process. Previous methods took 24 hours to trap just 2,000 atoms, limiting the scope of experiments at ALPHA. The Swansea-led team has changed that. Using laser-cooled beryllium ions, the team has demonstrated that it is possible to cool positrons to less than 10 Kelvin (below -263C), significantly colder than the previous threshold of about 15 Kelvin. These cooler positrons dramatically boost the efficiency of antihydrogen production and trapping -- allowing a record 15,000 atoms to be trapped in less than seven hours. Read more of this story at Slashdot.

  • Moss Spores Survive 9 Months Outside ISS
    by BeauHD on 21/11/2025 at 7:00 am

    alternative_right shares a report from Phys.org: Inspired by moss's resilience, researchers sent moss sporophytes -- reproductive structures that encase spores -- to the most extreme environment yet: space. Their results, published in the journal iScience on November 20, show that more than 80% of the spores survived nine months outside of the International Space Station (ISS) and made it back to Earth still capable of reproducing, demonstrating for the first time that an early land plant can survive long-term exposure to the elements of space. [Lead author Tomomichi Fujita of Hokkaido University and his team] subjected Physcomitrium patens, a well-studied moss commonly known as spreading earthmoss, to a simulated a space environment, including high levels of UV radiation, extreme high and low temperatures, and vacuum conditions. They tested three different structures from the moss -- protenemata, or juvenile moss; brood cells, or specialized stem cells that emerge under stress conditions; and sporophytes, or encapsulated spores -- to find out which had the best chance of surviving in space. The researchers found that UV radiation was the toughest element to survive, and the sporophytes were by far the most resilient of the three moss parts. None of the juvenile moss survived high UV levels or extreme temperatures. The brood cells had a higher rate of survival, but the encased spores exhibited ~1,000x more tolerance to UV radiation. The spores were also able to survive and germinate after being exposed to 196C for over a week, as well as after living in 55C heat for a month. Read more of this story at Slashdot.

  • Advocacy Groups Urge Parents To Avoid AI Toys This Holiday Season
    by BeauHD on 21/11/2025 at 3:30 am

    An anonymous reader quotes a report from the Associated Press: They're cute, even cuddly, and promise learning and companionship -- but artificial intelligence toys are not safe for kids, according to children's and consumer advocacy groups urging parents not to buy them during the holiday season. These toys, marketed to kids as young as 2 years old, are generally powered by AI models that have already been shown to harm children and teenagers, such as OpenAI's ChatGPT, according to an advisory published Thursday by the children's advocacy group Fairplay and signed by more than 150 organizations and individual experts such as child psychiatrists and educators. "The serious harms that AI chatbots have inflicted on children are well-documented, including fostering obsessive use, having explicit sexual conversations, and encouraging unsafe behaviors, violence against others, and self-harm," Fairplay said. AI toys, made by companies including Curio Interactive and Keyi Technologies, are often marketed as educational, but Fairplay says they can displace important creative and learning activities. They promise friendship but disrupt children's relationships and resilience, the group said. "What's different about young children is that their brains are being wired for the first time and developmentally it is natural for them to be trustful, for them to seek relationships with kind and friendly characters," said Rachel Franz, director of Fairplay's Young Children Thrive Offline Program. Because of this, she added, the trust young children are placing in these toys can exacerbate the types of harms older children are already experiencing with AI chatbots. A separate report Thursday by Common Sense Media and psychiatrists at Stanford University's medical school warned teenagers against using popular AI chatbots as therapists. Fairplay, a 25-year-old organization formerly known as the Campaign for a Commercial-Free Childhood, has been warning about AI toys for years. They just weren't as advanced as they are today. A decade ago, during an emerging fad of internet-connected toys and AI speech recognition, the group helped lead a backlash against Mattel's talking Hello Barbie doll that it said was recording and analyzing children's conversations. This time, though AI toys are mostly sold online and more popular in Asia than elsewhere, Franz said some have started to appear on store shelves in the U.S. and more could be on the way. "Everything has been released with no regulation and no research, so it gives us extra pause when all of a sudden we see more and more manufacturers, including Mattel, who recently partnered with OpenAI, potentially putting out these products," Franz said. Last week, consumer advocates at U.S. PIRG called out the trend of buying AI toys in its annual "Trouble in Toyland" report. This year, the organization tested four toys that use AI chatbots. "We found some of these toys will talk in-depth about sexually explicit topics, will offer advice on where a child can find matches or knives, act dismayed when you say you have to leave, and have limited or no parental controls," the report said. Read more of this story at Slashdot.

  • Fired Techie Admits Sabotaging Ex-Employer, Causing $862K In Damage
    by BeauHD on 21/11/2025 at 2:20 am

    An Ohio IT contractor pleaded guilty to breaking into his former employer's network after being fired, impersonating another worker and using a PowerShell script to reset 2,500 passwords -- an act that locked out thousands of employees and caused more than $862,000 in damage. He faces up to 10 years in prison. The Register reports: Maxwell Schultz, 35, impersonated another contractor to gain access to the company's network after his credentials were revoked. Announcing the news, US attorney Nicholas J. Ganjei did not specify the company in question, which is typical in these malicious insider cases, although local media reported it to be Houston-based Waste Management. The attack took place on May 14, 2021, and saw Schultz use the credentials to reset approximately 2,500 passwords at the affected organization. This meant thousands of employees and contractors across the US were unable to access the company network. Schultz admitted to running a PowerShell script to reset the passwords, searching for ways to delete system logs to cover his tracks -- in some cases succeeding -- and clearing PowerShell window events, according to the Department of Justice. Prosecutors said the attack caused more than $862,000 worth of damage related to employee downtime, a disrupted customer service function, and costs related to the remediation of the intrusion. Schultz is set to be sentenced on Jan 30, 2026, and faces up to ten years in prison and a potential maximum fine of $250,000. Read more of this story at Slashdot.

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