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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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  • The Anxieties of Full-Body MRI Scans (Not Covered by Insurance)
    by EditorDavid on 07/12/2025 at 2:34 am

    Washington Post columnist Dana Milbank calls himself "a highly creative hypochondriac" — who just paid for an expensive MRI scan to locate abnormal spots as tiny as 2 millimeters. He discusses the pros and cons of its "diffusion-weighted imaging" technology combined with the pattern recognition of AI, which theoretically "has the potential to save our lives by revealing budding cancers, silent aneurysms and other hidden would-be killers before they become deadly. " But the scans cost $2,500 a pop and insurance won't pay. Worse, for every cancer these MRIs find, they produce a slightly greater number of false positives that require a biopsy, with the potential for infection and bleeding and emotional distress. Even when the scans don't produce a false positive, they almost always come up with some vague and disconcerting abnormality.... Will we feel better after viewing our insides? Or will we become anxious about things we hadn't even thought to worry about? Part of living has always been in the mystery, in not knowing what tomorrow will bring. Now, because of sophisticated imaging, genome sequencing and other revolutionary screening tools, we can have predictability, or at least the illusion of it. But do we want that? The American College of Radiology says we do not. Its still-current 2023 statement says there is not "sufficient evidence" to recommend full-body screening, cautioning that the scan could lead to needless testing and expense. But David Larson, chair of ACR's Commission on Quality and Safety, told me that could change as more data comes in. "When people ask me, 'Would you recommend it?' I would say it depends on your tolerance for ambiguity," he said, giving the example of somebody found to have a borderline aortic aneurysm who is advised to wait and monitor it. If "that won't keep you up at night, then I wouldn't necessarily recommend against it...." About 1 in 20 gets that dreaded call. A study Prenuvo presented earlier this year of 1,011 participants found that 4.9 percent of scans required a follow-up biopsy. Of those, 2.2 percent were actually cancer, and the other 2.7 percent were false positives. Of the 22 cancers the scans caught, 86 percent of patients had no specific symptoms. But if finding something truly awful is rare, finding something abnormal is almost guaranteed. [Vikash Modi, Prenuvo's senior medical director of preventative medicine] said only 1 in 20 scans come back completely clean. The vast majority of patients wind up in the ambiguous realm where something may look suspicious but doesn't require urgent follow-up. He opted for the cheaper $1,000 torso scan, which the senior medical director calls "our bread-and-butter area," since 17 of the 22 cancers detected in one Prenuvo study were in that area and is where they often find cancers that wouldn't be discovered until they were incurable like "that scary pancreatic stuff...." Milbank's scan found 12 "abnormalities" included "a 2.5 mm pulmonary nodule in the right lower lobe" and "a 4.6 mm intraductal papillary mucinous neoplasm in the pancreatic tail" — but with 10 abnormalities labeled "minor" (and six being musculoskeletal wear-and-tear problems "I already knew about from the usual aches and pains".) Even the two "moderate" findings didn't sound that grim when I read on. The "indeterminant lesion" in my lung requires no follow-up, while the thing in my pancreas is "low-risk."... The "most interesting" finding was the pancreatic cyst, because, at this size and location, there's a 3 percent chance it will become cancerous in the next five years. But if annual follow-up scans of my pancreas (covered by insurance) show it's getting bigger, the cyst can be removed before it becomes cancer. For me, this made the MRI worthwhile. Sure, there was a 97 percent likelihood the cyst never would develop into a problem even if I hadn't learned about it. But now, with minimal inconvenience, I can eliminate that 3 percent risk of getting pancreatic cancer, the most lethal of major malignancies. Read more of this story at Slashdot.

  • Could America's Paper Checks Be On the Way Out, Like the Penny?
    by EditorDavid on 07/12/2025 at 12:21 am

    "First the penny. Next, paper checks?" asks CNN: When the U.S. Mint stopped making pennies last month for the first time in 238 years, it drew a lot of attention. But there have been quiet moves to stop using paper checks as well. The government stopped sending out most paper checks to recipients as of the end of September, part of an effort to fully modernize federal benefits payments. And on Thursday the Federal Reserve put out a notice that suggested it is considering — but only considering — the "winding down" of checking services it now provides for banks. The central bank's statement said that as an alternative to winding down those services, it is mulling more investment in its check processing services, but noted that would come at a higher cost. But it is also considering not making any such investments, in order to keep costs roughly unchanged. That would lead to reduced reliability of those services going forward. "Over time, check use has steadily declined, digital payment methods have grown in availability and use, and check fraud has risen," said the notice from the Fed. "Also, the Reserve Banks will need to make substantial investments in their check infrastructure to continue providing the same level of check services going forward." A report from the Federal Reserve Bank of Atlanta in June found that as of last year, more than 90% of surveyed consumers said they prefer to use something other than a check for paying bills, and just 6% paid by check. That's a sharp drop from the 18% of bills paid by checks as recently as 2017. Consumers also reported they view checks as second-worst for convenience and speed of payment, ahead of only money orders. And they're ranked as the least secure form of any payment other than cash. But even if it's true that options such as direct deposit, automatic bill paying and electronic payment systems such as Venmo, PayPal and Zelle have all reduced the need for traditional checks, paper checks are still an important part of the payment system. They make up about 5% of transactions and represent 21% of the value of all those payments, according to a statement from Michelle Bowman, the Fed's vice chair for supervision, who dissented from the Fed's Thursday statement. Read more of this story at Slashdot.

  • Google Must Limit Its 'Default Search' Contracts to One Year, Judge Rules
    by EditorDavid on 06/12/2025 at 11:21 pm

    Bloomberg reports that Google "must renegotiate any contract to make its search engine or artificial intelligence app the default for smartphones and other devices every year, a federal judge ruled." Judge Amit Mehta in Washington sided with the US Justice Department on the one year limitation in his final ruling on what changes the search giant must make in the wake of a landmark ruling that the company illegally monopolized online search. The yearly renegotiation will give rivals — particularly those in the burgeoning generative AI field — a chance to compete for key placements. The final judgment will still allow Google to offer its products to Apple Inc. for use in its popular iPhone and pay other electronics makers like Samsung Electronics Co. for default placement. But the judge said those contracts must be renegotiated annually. Mehta noted in his ruling that both Google and the US government said they could work with the one-year limitation on default contracts. As such, "the court holds that a hard-and-fast termination requirement after one year would best carry out the purpose of the injunctive relief." Read more of this story at Slashdot.

  • Woman Hailed As a Hero For Smashing Man's Meta Smart Glasses On Subway
    by EditorDavid on 06/12/2025 at 9:59 pm

    "Woman Hailed as Hero for Smashing Man's Meta Smart Glasses on Subway," reads the headline at Futurism: As Daily Dot reports, a New York subway rider has accused a woman of breaking his Meta smart glasses. "She just broke my Meta glasses," said the TikTok user, who goes by eth8n, in a video that has since garnered millions of views. "You're going to be famous on the internet!" he shouted at her through the window after getting off the train. The accused woman, however, peered back at him completely unfazed, as if to say that he had it coming. "I was making a funny noise people were honestly crying laughing at," he claimed in the caption of a followup video. "She was the only person annoyed..." But instead of coming to his support, the internet wholeheartedly rallied behind the alleged perpetrator, celebrating the woman as a folk hero — and perfectly highlighting how the public feels about gadgets like Meta's smart glasses. "Good, people are tired of being filmed by strangers," one user commented. "The fact that no one else on the train is defending him is telling," another wrote... Others accused the man of fabricating details of the incident. "'People were crying laughing' — I've never heard a less plausible NYC subway story," one user wrote. In a comment on TikTok, the man acknowledges he'd filmed her on the subway — it looks like he even zoomed in. The man says then her other options were "asking nicely to not post it or blur my face". He also warns that she could get arrested for breaking his glasses if he "felt like it". (And if he sees her again.) "I filed a claim with the police and it's a misdemeanor charge." A subsequent video's captions describe him unboxing new Meta smartglasses "and I'm about to do my thing again... no crazy lady can stop me now." I'm imagining being mugged — and then telling the mugger "You're going to be internet famous!" But maybe that just shows how easy it is to weaponize smartglasses and their potential for vast public exposure. Read more of this story at Slashdot.

  • A 1950s Material Just Set a Modern Record For Lightning-fast Chips
    by EditorDavid on 06/12/2025 at 8:49 pm

    "Researchers engineered a strained germanium layer on silicon that allows charge to move faster than in any silicon-compatible material to date," reports Science Daily. "This record mobility could lead to chips that run cooler, faster, and with dramatically lower energy consumption. "The discovery also enhances the prospects for silicon-based quantum devices..." Scientists from the University of Warwick and the National Research Council of Canada have reported the highest "hole mobility" ever measured in a material that works within today's silicon-based semiconductor manufacturing.... The researchers created a nanometer-thin germanium epilayer on silicon that is placed under compressive strain. This engineered structure enables electric charge to move faster than in any previously known silicon-compatible material... The findings establish a promising new route for ultra-fast, low-power semiconductor components. Potential uses include quantum information systems, spin qubits, cryogenic controllers for quantum processors, AI accelerators, and energy-efficient servers designed to reduce cooling demands in data centers. This achievement also represents a significant accomplishment for Warwick's Semiconductors Research Group and highlights the UK's growing influence in advanced semiconductor materials research. Read more of this story at Slashdot.

  • Chernobyl's Protective Shield Can No Longer Confine Radiation, UN Nuclear Watchdog Says
    by EditorDavid on 06/12/2025 at 7:34 pm

    "A structure designed to prevent radioactive leakage at the defunct Chernobyl nuclear plant in Ukraine is no longer operational," reports Politico, "after Russian drones targeted it earlier this year, the U.N.'s nuclear watchdog has found." [T]he large steel structure "lost its primary safety functions, including the confinement capability" when its outer cladding was set ablaze after being struck by Russian drones, according to a new report by the International Atomic Energy Agency. Beyond that, there was "no permanent damage to its load-bearing structures or monitoring systems," it said. "Limited temporary repairs have been carried out on the roof, but timely and comprehensive restoration remains essential to prevent further degradation and ensure long-term nuclear safety," IAEA Director General Rafael Mariano Grossi said in astatement. The Guardian has pictures of the protective shield — incuding the damage from the drone strike. The shield is the world's largest movable land structure, reports CNN: The IAEA, which has a permanent presence at the site, will "continue to do everything it can to support efforts to fully restore nuclear safety and security," Grossi said.... Built in 2010 and completed in 2019, it was designed to last 100 years and has played a crucial role in securing the site. The project cost €2.1 billion and was funded by contributions from more than 45 donor countries and organizations through the Chernobyl Shelter Fund, according to the European Bank for Reconstruction and Development, which in 2019 hailed the venture as "the largest international collaboration ever in the field of nuclear safety." Read more of this story at Slashdot.

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