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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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  • Pan Am Plane Crash That Inspired Modern Safety Briefings Found After 74 Years
    by BeauHD on 23/07/2026 at 3:30 am

    Longtime Slashdot reader BeaverCleaver shares a report from the BBC: The wreckage of a Pan American Airways plane has been found 74 years after it plunged into the Atlantic Ocean in a crash that prompted mandatory airline safety briefings. The Clipper Endeavor was found 2,000ft (610m) below sea level off the coast of Puerto Rico with a sonar-equipped drone. It went down on April 11, 1952, following multiple-engine failure shortly after take-off. Everyone onboard survived the impact -- but passengers struggled to locate life vests and rafts as the plane rapidly sank. Of the 69 passengers and crew onboard, just 17 survived. The disaster led to sweeping reforms in aviation safety, including compulsory pre-flight safety briefings on every commercial flight. [...] Today, before every commercial flight, cabin crew are required to outline where a plane's exits are, as well as the location of life vests and how to inflate them. Read more of this story at Slashdot.

  • GM Is Quietly Becoming a Subscriptions Company
    by BeauHD on 22/07/2026 at 11:00 pm

    "General Motors has been pulling a Tim Cook and boosting its software and subscription business," reports Business Insider. During the automaker's Tuesday earnings call, executives said they're increasingly leaning on software subscriptions like OnStar and Super Cruise to generate high-margin recurring revenue long after customers buy their vehicles. GM says OnStar brought in about $800 million in the second quarter, while Super Cruise revenue grew about 70% year over year. From the report: GM says its software business keeps roughly 70 cents of every dollar it brings in. That's a rare level of profitability in the auto industry, as many car sales generate just four to 10 cents per sales dollar. [...] GM expects to add about 1 million OnStar subscribers this year, bringing the total close to 13 million. Super Cruise, GM's hands-free, eyes-on driving system, is growing even faster. GM added about 70,000 subscribers during the quarter and expects to end the year with more than 850,000. Revenue from the service increased about 70% from a year earlier. And a lot of drivers are sticking around after the free period ends. GM said between 30% and 40% of eligible owners continue paying after their included three-year Super Cruise subscription expires. [..] "We do think we have tremendous levers, multiple levers of growth," Barra said on the call. "We definitely think there's a lot of opportunity at GM to grow, improve margins, and become less cyclical." "Software and services are becoming increasingly important to how customers experience GM vehicles and how we deliver value beyond the initial purchase," a spokesperson previously told Business Insider. "As vehicles become more software-defined, we can introduce new digital experiences through updates and optional services rather than hardware changes." Read more of this story at Slashdot.

  • iOS 27 Code Suggests Apple Could Restrict Leased Devices After Missed Payments
    by BeauHD on 22/07/2026 at 10:00 pm

    Code found in the iOS 27 beta suggests Apple is developing a system that could restrict leased iPhones when customers fall behind on payments. The discovery follows a recent Bloomberg report that Apple may soon launch a new "Apple Upgrade" leasing program, allowing customers to pay for hardware through monthly installments. 9to5Mac reports: The code describes a system called App Managed Features, which allows an authorized financing or provider app to enroll an iPhone and perform ongoing status checks. If the contract is no longer in good standing, Apple's system services can place the iPhone in "Restricted Mode," which blocks access to most apps until the payment or contract issue is resolved, while keeping a small set of apps available. The fixed allowlist currently found in the iOS 27 beta includes: Accessibility Reader, App Store, Health, Magnifier, Phone, Clock, Settings, Wallet, Passwords, and the Restricted Mode interface itself. Apps that can send critical alerts, such as Messages, Home, and certain medication or safety apps, may also remain accessible. However, the provider appears to have some control over those exceptions. The code does not appear to cancel, suspend, or otherwise modify App Store subscriptions associated with blocked apps. As a result, a subscription could continue billing even while access to its app is restricted. Additionally, there isn't a fixed number of missed payments that automatically triggers the restrictions. The financing provider's app decides when to lock the device based on its own policies. Finally, the new framework also introduces a new type of activation lock called "Partner Finance Lock," which is meant to prevent users from erasing, reselling, or stripping a restricted device for parts. Read more of this story at Slashdot.

  • Linux Kernel Team Publishes 432 CVEs In Two Days
    by BeauHD on 22/07/2026 at 9:00 pm

    Ancient Slashdot reader alanw shares a post from the OSS Security mailing list, where sysadmin Jan Schaumann wonders what to do after the Linux kernel cranked out 432 CVEs in a little over 24 hours: "I understand the position that CVEs were always a flawed way to track or prioritize security changes... But this onslaught really shows it's not feasible to attempt to prioritize individual kernel changes. I'm not sure what to do here going forward." The Register reports: The nixCraft team speculated on social media that AI bug reports are a likely reason for all those kernel CVEs, which wouldn't be without precedent - Linus Torvalds himself said in May that the Linux kernel security mailing list had become "almost entirely unmanageable" due to AI-assisted bug hunting. Nonetheless, Torvalds has described AI as a useful tool for Linux development while still noting it can be a drag for maintainers, both from a workload standpoint and the fact "it keeps finding embarrassing bugs." [...] Unfortunately for Linux sysadmins, the position in which they find themselves in this current mess isn't one that's readily solved. CVEs might be a messy way to track and prioritize security updates, especially when hundreds of them are published over a short period, but without something better, it falls to IT and security teams to determine which vulnerabilities affect their systems and which kernel updates they need to deploy. Senior kernel maintainer Greg Kroah-Hartman replied to Jan's post, pushing back on the idea that the kernel's CVE volume is uniquely unmanageable. The kernel isn't special, he argues -- companies everywhere are finally realizing they need to re-evaluate how they update all of their systems and devices, something that's traditionally been "woefully ignored." On the "just always update" approach, Greg says that's precisely what the kernel community endorses: "This is what the kernel developer community recommends and supports. If you want support from us, do this." Can't manage it yourself? Pay a company for support, or "just use Debian or Yocto as their security practices are amazing." He points to Android as proof the approach scales, calling it "the largest deployment of software in the world" -- billions of devices kept updated "with one very-overworked developer guiding it all." As for reviewing every CVE individually, he notes this can be largely automated by intersecting the files a CVE touches with the files you actually build, which typically trims the relevant set "down to about 10% of the overall total" -- the approach enterprise distros already take for their customers. Panic-mode selective patching gets a blunt "Good luck with that!" -- regulations like the EU's Cyber Resilience Act are set to legislate that habit away ("rightfully so," in his view), and "your insurance company might wish to have a talk with you as well." Greg also warns the flood isn't over: "The number of llm-found issues is only on the rise right now, it's going to be a very long 18 months at the least to dig ourselves out of this mess, and people had BETTER be updating their systems all along the way if they expect to be secure in any way." As for the 432-CVE burst itself, he explains it was simply him catching up on a weeks-old, publicly visible review queue over the weekend -- delayed by "a perfect storm of 6 weeks straight of conferences and vacations" -- so it shouldn't have come as a surprise to anyone watching the public git repo. Read more of this story at Slashdot.

  • Apple Partners With Klarna To Offer iPhones, Macs On a Subscription Basis
    by BeauHD on 22/07/2026 at 8:00 pm

    Apple is reportedly launching a Klarna financing deal that will let U.S. customers spread the cost of devices over up to three years, pushing the company closer to a hardware-as-a-service model. "The only thing you don't get under the new arrangement is AppleCare, for which you'll allegedly need to pay extra," notes Computerworld. From the report: The introduction of the scheme gives consumers a way to purchase the company's popular high-end devices when they are introduced -- no doubt,at higher cost -- this fall. [...] A combination of changed customer habits and external threat means the stars are now aligned for hardware-as-a-service models. "Reframing a device as a low monthly payment protects that [upgrade] cadence and allows Apple to start marketing their products as device-as-a-service to consumers, which no other vendor was ever able to do," [IDC analyst Francisco Jeronimo] wrote to me. There is a one-more-thing aspect to this: the products are effectively being leased, a new approach that will give Apple a stronger grip on EOL devices, helping it grab more of them for refurbishment, resale, and recycling. Over time, this will give the company a much stronger grip on the lucrative second-user market that exists around Apple equipment, even while for almost every consumer product we find the life we want is something we can rent, but probably can't afford to own. The other solid reason to take a partnership approach is risk management. Apple had intended to develop its own buy-now, pay-later scheme via Apple Pay Later, but abandoned that plan as it became riskier with rising bank rates. "Also, by backing the program with Klarna rather than reviving the in-house subscription plan it shelved in 2024, Apple captures the demand upside without taking the credit risk onto its own balance sheet," Jeronimo said. "Apple Upgrade lands at precisely the moment Apple needs it," Jeronimo wrote in a note seen by Computerworld. "Having just pushed Mac and iPad prices up on the back of the memory shortage, with iPhone increases widely expected in September -- as well as the new iPhone foldable expected at $2,500 -- Apple's real risk is that rising prices even further can impact the upgrade cycle." Read more of this story at Slashdot.

  • The Army Is Burning Through Its AI Tokens
    by BeauHD on 22/07/2026 at 7:00 pm

    An anonymous reader quotes a report from Wired: A little over a month after the Department of Defense (DOD) bragged that nearly half of its 3.5 million employees were using AI at work, members of the Army's Combat Capabilities Development Command (DEVCOM) received an email informing them that they were burning through tokens, and needed to limit use. "Although the Army CIO announced in May 2026 that they were offering unlimited tokens, by mid-June the Army CIO pool was exhausted of tokens and had to re-establish limits," the email reads. The email goes on to say that although the Army has chosen to renew token usage at "its current levels," it's unclear "if the Army CIO pool will be renewed after 1 Oct." The Army uses Ask Sage, a multimodal generative AI platform where users can run different large language models (LLMs), including Alphabet's Gemini, Meta's Llama, and OpenAI's ChatGPT. "Apparently the whole Army burned through the whole year of tokens for just one service," says an Army employee who spoke to WIRED [...]. The Army employee says that the Army has been pushing its workers to lean into using generative AI. Employees were given an allotment of at least 200,000 tokens per month, according to emails viewed by WIRED, and were automatically allocated more if they burned through their initial allotment. Employees who had signed up for Ask Sage but were not regularly using it would receive emails encouraging them to use more of their allocated tokens. In order to use Ask Sage, the Army had access to 100,000,000 tokens as part of an annual subscription to an "enterprise pack." Tokens represent a unit of output, either in text or image, from an LLM. For the Ask Sage tool, a single token equates to about 3.7 characters, according to documents viewed by WIRED. The Defense Department burned through some 20 billion tokens per day during the 38-day Operation Epic Fury in Iran, according to Breaking Defense. It's unclear if the tokens used by regular DOD employees are drawn from the same pool as those who might be using AI tools on classified or secret information. Read more of this story at Slashdot.

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