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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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  • Study Claims To Provide First Direct Evidence of Dark Matter
    by BeauHD on 26/11/2025 at 10:00 am

    An anonymous reader quotes a report from the Guardian: Nearly a century ago, scientists proposed that a mysterious invisible substance they named dark matter clumped around galaxies and formed a cosmic web across the universe. What dark matter is made from, and whether it is even real, are still open questions, but according to a study, the first direct evidence of the substance may finally have been glimpsed. More work is needed to rule out less exotic explanations, but if true, the discovery would go down as a turning point in the decades-long search for the elusive substance that is said to make up 27% of the cosmos. "This could be a crucial breakthrough in unraveling the nature of dark matter," said Prof Tomonori Totani, an astrophysicist at the University of Tokyo, who said gamma rays emanating from the centre of the Milky Way appeared to bear the signature of the substance. [...] To search for potential dark matter signals, Totani analysed data from Nasa's Fermi Gamma-ray Space Telescope, which detects the most energetic photons in the electromagnetic spectrum. He spotted a pattern of gamma rays that appeared to match the shape of the dark matter halo that spreads out in a sphere from the heart of the galaxy. The signal "closely matches the properties of gamma-ray radiation predicted to be emitted by dark matter," Totani told the Guardian. Details are published in the Journal of Cosmology and Astroparticle Physics. If Totani has seen dark matter at work, the observations suggest it is made from elementary particles 500 times more massive than the proton. But far more work is needed to rule out other astrophysical processes and background emissions that could explain the signals. Totani said the "decisive factor" would be detecting gamma rays with the same spectrum from other regions of space, such as dwarf galaxies. According to Prof Justin Read, an astrophysicist at the University of Surrey, the lack of significant signals from such galaxies strongly argues against Totani having seen gamma rays emitted from dark matter particle annihilation. Prof Kinwah Wu, a theoretical astrophysicist at UCL, urged caution, saying: "I appreciate the author's hard work and dedication, but we need extraordinary evidence for an extraordinary claim," he said. "This analysis has not reached this status yet. It is a piece of work which serves as an encouragement for the workers in the field to keep on pressing." Read more of this story at Slashdot.

  • China Launches An Emergency Lifeboat To Bring Three Astronauts Back To Earth
    by BeauHD on 26/11/2025 at 7:00 am

    China launched an uncrewed Shenzhou 22 spacecraft to serve as an emergency lifeboat for three astronauts aboard the Tiangong space station after a docked return craft was found to have a cracked window likely caused by space debris. "A Long March 2F rocket fired its engines and lifted off with the Shenzhou 22 spacecraft, carrying cargo instead of a crew, at 11:11 pm EST Monday (04:11 UTC Tuesday)," reports Ars Technica. "The spacecraft docked with the Tiangong station nearly 250 miles (400 kilometers) above the Earth about three-and-a-half hours later." From the report: Chinese engineers worked fast to move up the launch of the Shenzhou 22, originally set to fly next year. On November 4, astronauts discovered one of the two crew ferry ships docked to the Tiangong station had a damaged window, likely from an impact with a small fragment of space junk. [...] Now, 20 days after the saga began, the Tiangong outpost again has a lifeboat for its long-term residents. Astronauts Zhang Lu, Fu Wei, and Zhang Hongzhang will return to Earth on the Shenzhou 22 spacecraft next year, soon after the arrival of their three replacements. The Tiangong astronauts will head outside the station on a spacewalk to inspect the damaged window on Shenzhou 20. Eventually, Shenzhou 20 will depart Tiangong and reenter the atmosphere with cargo. Assuming a smooth landing, Chinese engineers will have an opportunity to get a closer look at the damage on the ground to inform the design of future spacecraft. A preliminary assessment of the window indicates the crack is in the outermost layer of heat-insulating glass in Shenzhou 20's porthole window, according to Chinese state media. Engineers on the ground conducted simulations and wind tunnel ablation tests to determine whether the window might fail during reentry. "The results showed that the cracks would still propagate further," reported CCTV, China's government-run television network. "We held review meeting, and everyone agreed that ensuring the safe return of the astronauts was too risky with the glass damaged," Zhou said. While this crew is just one month into their planned six-month expedition, an emergency could force them to leave the station and return home at any time. Although remote, another collision with space junk, a major systems failure, or a medical emergency involving one of the astronauts could trigger an evacuation. That's why Chinese officials wanted to quickly launch Shenzhou 22 to give the crew a ticket home.The International Space Station follows the same policy, with SpaceX's Dragon spacecraft and Russian Soyuz ships serving as lifeboats until their crews' scheduled return to Earth. Read more of this story at Slashdot.

  • Britain Plots Atomic Reboot As Datacenter Demand Surges
    by BeauHD on 26/11/2025 at 3:30 am

    The UK is seeking to fast-track new atomic development to meet soaring energy demands driven by AI and electrification. According to a new report published by the government's Nuclear Regulatory Taskforce, excessive regulation has made Britain the most expensive place in the world to build nuclear projects. The report is calling for a sweeping overhaul to accelerate reactor construction -- everything from "streamlining regulation" to relaxing environmental and safety constraints. The Register reports: The document outlines 47 recommendations for the government, which come under five general areas: providing clearer leadership and direction for the nuclear sector; simplifying the regulatory approval process for atomic projects; reducing risk aversion; addressing incentives to delay progress; and working with the nuclear sector to speed delivery and boost innovation. Among the recommendations is that a Commission for Nuclear Regulation should be established, becoming a "unified decision maker" across all other regulators, planners, and approval bodies. The report also talks of reforming environmental and planning regimes to speed approvals, echoing the government's earlier decisions to streamline the planning process to make it easier for datacenter projects to get built. It recommends amending the cost cap for judicial reviews and limiting legal challenges to Nationally Strategic Infrastructure Projects (NSIPs), while indemnifying nuclear developers against any damages they might incur as a result of proceeding with their project while a judicial review is still being decided. Another recommendation that may be cause for concern is that the government should modify the Habitats Regulations to reduce costs. These are rules created to protect the most important and vulnerable natural sites and wildlife species across the UK. The report also states that radiation limits for workers are overly conservative and well below what could be appropriately considered "broadly acceptable," claiming that they are many times less than what the average person in the UK normally receives in a year. Read more of this story at Slashdot.

  • Plex Is Now Enforcing Remote Play Restrictions On TVs
    by BeauHD on 26/11/2025 at 2:02 am

    Plex is beginning to enforce new restrictions on remote streaming for its TV apps, requiring either a Plex Pass or the cheaper Remote Watch Pass to watch media from servers outside your home network. How-To Geek reports: Plex is now rolling out the remote watch changes to its Roku TV app. This means that you will need a Plex Pass or Remote Watch Pass for your Plex account if you want to stream media from a server outside your home. If you're only watching media from your own server on the same local network as your Roku device, or the owner of the server you're streaming from has Plex Pass, you don't have to do anything. Plex says this change will come to the other TV apps in 2026, such as Fire TV, Apple TV, and Android TV. Presumably, that will happen when the redesigned app arrives on those platforms. Roku was just the first TV platform to get the new app, which caused a wave of complaints from users about removed functionality and a more clunky redesign. Plex is addressing some of those complaints with more updates, but adding another limitation at the same time isn't a great look. The Remote Watch Pass costs $2 per month or $20 per year, but there's no lifetime purchase option. You can also use a Plex Pass, which normally costs $7 per month, $70 per year, or $250 for a lifetime license. However, there's currently a 40% off sale for Plex Pass subscriptions. Read more of this story at Slashdot.

  • HP To Cut About 6,000 Jobs By 2028, Ramps Up AI Efforts
    by BeauHD on 26/11/2025 at 1:25 am

    HP plans to cut 4,000-6,000 jobs by 2028 "as part of a plan to streamline operations and adopt artificial intelligence," reports Reuters. From the report: HP's teams focused on product development, internal operations and customer support will be impacted by the job cuts, CEO Enrique Lores said during a media briefing call. "We expect this initiative will create $1 billion in gross run rate savings over three years," Lores added. The company laid off an additional 1,000 to 2,000 employees in February, as part of a previously announced restructuring plan. Demand for AI-enabled PCs has continued to ramp externally, reaching over 30% of HP's shipments in the fourth quarter ended October 31. Read more of this story at Slashdot.

  • Warner Music Group Partners With Suno To Offer AI Likenesses of Its Artists
    by BeauHD on 26/11/2025 at 12:45 am

    Warner Music Group has reached a licensing deal with Suno that will let users create AI-generated music using the voices and likenesses of artists who opt in. WMG says participating artists will have "full control" over how their likeness and music are used. "These will be new creation experiences from artists who do opt in, which will open up new revenue streams for them and allow you to interact with them in new ways," Suno says, adding that users will be able to "build around" an artist's sounds "and ensure they get compensated." WMG is also dropping its previous lawsuit accusing Suno of scraping copyrighted material. "Along with the licensing agreement, Suno is planning to use licensed music from WMG to build next-gen music generation models that it claims will surpass its flagship v5 model," adds The Verge. "It will also start requiring users to have a paid account to download songs starting next year, with each tier providing a specific number of downloads each month." Further reading: First 'AI Music Creator' Signed by Record Label. More Ahead, or Just a Copyright Quandry? Read more of this story at Slashdot.

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