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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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  • Scientists Discover 27 Potential New Planets That Orbit Two Stars
    by BeauHD on 04/05/2026 at 4:00 pm

    Astronomers have identified 27 potential new circumbinary planets -- worlds that orbit two stars, like Star Wars' Tatooine. "To date, only about 18 circumbinary planets ... had been identified in the universe," reports the Guardian. "More than 6,000 planets have been discovered that orbit single stars, like Earth does around the sun." The Guardian reports: In a timely publication for May 4, also known as Star Wars Day, scientists have identified nearly 30 more candidate planets, whose distances range from 650 to 18,000 light years away from Earth. [...] More than half of the stars in the universe exist in binary or multiple star systems. The researchers instead used a method known as "apsidal precession," searching for a wobble between stars that orbit around and eclipse each other. "If we monitor the exact timing of these eclipses ... that can tell us that there's something else going on in the system," said Margo Thornton, the study's lead author and a PhD candidate at UNSW. After eliminating other factors such as the rotation and gravitational pull of the two stars, the team identified 36 star systems out of 1,590 whose behavior could only be explained by a third body. For "27 of those objects, it is possible that they are planet mass," Thornton said. More research into their spectra -- the light they emit -- was needed to formally confirm them as circumbinary planets, she said. "It's just a matter of: what is the mass of it? Is it a planet? Is it a brown dwarf? Is it a star?" The team discovered the potential planets -- which likely range from Neptune-sized to ten times heavier than Jupiter -- using data from Nasa's Transiting Exoplanet Survey Satellite, a planet-hunting space telescope that launched in 2018. The research was published in the Monthly Notices of the Royal Astronomical Society. Read more of this story at Slashdot.

  • Infrasound Waves Stop Kitchen Fires, But Can They Replace Sprinklers?
    by BeauHD on 04/05/2026 at 3:00 pm

    An anonymous reader quotes a report from Ars Technica: In a makeshift demonstration kitchen in Concord, California, cooking oil splatters in and around a frying pan, which catches fire on an unattended gas stove. Within moments, a smoke detector wails. But in this demonstration, something less common happens: An AI-driven sensor activates and wall emitters blast infrasound waves toward the source of the fire in an attempt to put it out. The science of acoustic fire suppression, which has long been known and documented in scientific literature and the press, works by vibrating oxygen molecules away from a fuel source, depriving the fire of a critical component needed for combustion. Indeed, after just a few seconds of infrasound, the tiny kitchen blaze goes out. "We were able to not just point-and-shoot like a fire extinguisher; we figured out how to run it through ducting and distribute it like a sprinkler system," said Geoff Bruder, co-founder and CEO of Sonic Fire Tech, during the presentation. The company's goal is to replace sprinklers, which are effective at stopping fires but can also do significant water damage to a property. Sonic Fire Tech appears to be the first company trying to commercialize the science of acoustic fire suppression. Its executives have already been touring Southern California; Wednesday's event was the first in the northern half of the state. The company aims to make this infrasound technique mainstream in both commercial (for instance, a data center, where sprinklers would damage electronics) and in-home installations, given that sprinklers are already required in all new California homes built in 2011 and later. Sonic Fire Tech also hopes to produce a backpack-based system that could be worn by wildland firefighters headed out into the field. "We are making meaningful technological improvements on a monthly basis," Stefan Pollack, a company spokesperson, emailed Ars after the event. But two experts who spoke with Ars raised serious questions about the potential for this technology to supplant traditional sprinklers in a home. They are even more skeptical as to whether the technique can be effective in an uncontrolled wildfire situation, where flames can grow very quickly. Experts are concerned that infrasound may knock down small flames but does not cool hot surfaces or wet fuel like sprinklers do, which raises the risk of re-ignition, smoldering fires, hidden fires, or blocked fires. Sonic Fire Tech has claimed third-party validation and possible NFPA 13D equivalency, but it has not publicly released full testing details. Fire officials and outside observers also want more information about reliability, maintenance, calibration, and how system failures would be detected and communicated. Read more of this story at Slashdot.

  • 16% of Parents Help Their Children Bypass Online Age Checks, Study Finds. One 15-Year-Old Just Uses a Fake Moustache
    by EditorDavid on 04/05/2026 at 11:34 am

    The Independent reports that "more than a third of children in the UK have found a way around age verification measures" for social media sites and other online platforms. And new research from online safety organisation Internet Matters "suggests one in six parents have helped their child to get past age verification checks, with children reporting 'tricking' platforms into thinking they are older. " Parents also said they had caught their children drawing on facial hair in a bid to evade the technology. One mother said: "I did catch my son using an eyebrow pencil to draw a moustache on his face, and it verified him as 15 years old"... From a sample of 1,000 UK children, 46% said they believed age checks are easy to bypass, while 32% admitted to having done so. 49% of the children surveyed said they'd still encountered harmful content, according to the online safety activists. The group called the figure "unacceptable," and complained that age verification measures "are often ineffective in practice or easy to bypass." Read more of this story at Slashdot.

  • Can Investors Trust AI Sales Figures? Asks Wall Street Journal Opinion Piece
    by EditorDavid on 04/05/2026 at 7:34 am

    A Wall Street Journal opinion piece warns of "a troubling trend" in AI's growth. "Rather than selling software, some AI companies are paying their partners to use it." It cites OpenAI's $1.5 billion joint venture with private-equity firms, Anthropic's $200 million contribution to a private-equity firm joint venture, and Google's $750 million subsidization of Gemini's adoption by consulting firms. "These agreements muddy the distinction between a company's sound growth trajectory and artificial financial engineering." [T]he scale and structure of the recent AI deals go beyond standard incentive mechanisms... When a seller pays customers to buy its products, it is unclear if its revenue growth reflects vibrant demand or a willingness to accept subsidies. Slashdot reader destinyland writes: This warning comes from a prominent figure in the investing community. For six years Robert Pozen was chairman of America's oldest mutual fund company, after five years at Fidelity. An advocate for corporate governance, he's currently a lecturer at MIT's business school (and the author of the book Remote Inc.: How to Thrive at Work...Wherever You Are). "As AI companies prepare initial public offerings, investors should scrutinize their numbers closely," Pozner writes, warning about "time-limited financial support". "In evaluating AI sales figures, analysts should consider the distorted incentives that the recent financing deals create," writes Pozner: Private-equity firms, enticed by promised returns, might demand rapid rollouts of AI products, rather than ensuring their orderly and safe development. Portfolio companies of private-equity firms may embrace AI tools not because they are needed but because adoption is mandated by their owners. Consultants may favor one set of AI models based on the subsidy instead of the merits. If guarantees and subsidies are major factors in the rapid adoption of AI tools, investors should be skeptical of AI companies' revenue projections. Many of their customers enticed by consultants will stop paying full price when the financial incentives are gone. Many of the portfolio companies of private-equity firms could back away from selected AI tools once these joint ventures expire. The challenge with evaluating these AI financing deals is the lack of transparency. At present, AI vendors don't separate revenue driven by subsidies or joint ventures from standard sales. The lesson from the telecom debacle is that financial engineering can obscure, for years, the difference between real customer demand and demand driven by incentives. When AI companies begin to finance their own product distribution, guaranteeing returns to investors and subsidizing sales, it's a signal for investors to dig deeper. Investing in an AI company? Ask what percentage of enterprise revenue is coming from subsidized channels or joint ventures, Pozner suggests. And the renewal/retention rate for customers not supported by subsidies or joint ventures... Read more of this story at Slashdot.

  • Roblox Blames Age-Verification Rollout for Lowered Growth. Stock Tumbles 22%
    by EditorDavid on 04/05/2026 at 4:34 am

    Age verification became mandatory for chat access on Roblox in January — and Friday morning Quartz reported it's apparently impacted the company's financials: Roblox cut its full-year 2026 bookings forecast by roughly $900 million at the midpoint on Thursday, blaming stronger-than-expected headwinds from its mandatory age-verification rollout on an audience that skews heavily toward children and teenagers. Full-year 2026 bookings are now projected at $7.33 billion to $7.60 billion, a range that sits roughly $900 million below the prior guidance of $8.28 billion to $8.55 billion; analysts had expected $8.38 billion, according to Yahoo Finance. Roblox stock fell almost 22% in premarket trading.... Daily active users rose 35% year over year to 132 million, while hours engaged climbed 43% to 31 billion hours... Daily Active Users and hours engaged fell below forecasts of 143.8 million and 33.68 billion, respectively, according to Yahoo Finance... Users who have not completed age checks have faced restricted communication features, and the process has weighed on the platform's ability to bring in new users. Russia's blocking of the platform, which took effect in December 2025, added further drag on user growth, according to Yahoo Finance. As of the end of the first quarter, 51% of global daily active users had completed age verification, with 65% of U.S. users having done so, Roblox said.... The safety push has come with legal costs. Roblox accrued $57 million in the first quarter for settlements and settlement proposals with certain states over youth-related consumer protection and digital safety matters, with payments structured over multiple years, the company said. Roblox acknowledged in a letter to shareholders that "our aggressive push to enhance safety lowers our expectations for topline growth in 2026." But they argued that it also "makes our platform fundamentally better and amplifies the long-term growth potential of Roblox through more effective content targeting, tailored communication experiences, and improved community sentiment." Read more of this story at Slashdot.

  • NetHack 5.0 Released
    by EditorDavid on 04/05/2026 at 2:09 am

    "So yesterday the Devteam (it is always the Devteam) released version 5.0 of legendary and venerable rogueike compuer game NetHack," writes the Rogue-like games column @Play. "It is 39 years old..." MilenCent (Slashdot reader #219,397) writes: In addition to play changes it's left for players to discover, this version updates the code to compile with C99, makes it much easier to cross compile the code for other systems than the one running, and now uses Lua for its dungeon generation. Happy hacking! For new players, "Nethack 5.0 now has an optional tutorial in the early phases of the game that might help you," notes the Rogue-like games column @Play: Three systems binaries are provided: Windows, MS-DOS and Amiga. Yes, Nethack still supports MS-DOS, and yes, it still supports classic Amiga: it explicitly supports AmigaDOS 3.0, meaning it can still run on 68000 machines... That these are the only systems they provide binaries for shouldn't be seen as an indication that these are the "most important" platforms for Nethack, it's more that, since it's entirely open source, building it yourself is entirely possible, and more expected than with most software. Nethack can be built for Linux, Windows 8-11, AmigaDOS, MacOS (I'm not sure if this includes classic Mac too but it might), Windows CE (wow), OS/2 (additional wow), BeOS, VMS and multiple Unixes... Another option is to play through public Nethack servers. The most popular of these are probably alt.org and Hardfought. Read more of this story at Slashdot.

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