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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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  • Facial Recognition in UK Shops Will Soon Instantly Alert Police About Offenders
    by EditorDavid on 12/07/2026 at 7:52 am

    Facial recognition technology in U.K. shops "will soon alert police in real time to the presence of serious offenders," reports The Guardian, "with civil liberties groups warning of a 'dangerous escalation' towards surveillance and criminalisation in the retail sector." Facewatch, a facial recognition system used by more than 100 businesses including Sainsbury's, B&M and Spar to monitor thieves, said it was launching a UK-first feature to "alert police instantly when the most serious offenders trigger a live facial recognition match". Facewatch's chief executive, Nick Fisher, said the "unique technical development" would be launched in autumn and would warn police in an average of four seconds when the "worst offenders" were flagged on its network... Charlie Whelton, the policy and campaigns officer at [civil liberties nonprofit] Liberty, said it was concerned about this "untested, opaque development" and the way facial recognition technology had been allowed to "proliferate without anything to govern it". "It's not against the law to walk into a shop even if you've committed crimes in the past," he said. "The idea of calling the police on somebody who hasn't committed a crime, but there's a concern they might, is really upending the way we do things. And of course, it's not infallible. These systems do make mistakes, and it's very hard to argue with that when it happens to you." A number of people have been forced to leave shops after being falsely identified by Facewatch technology as a shoplifter, with some describing it as "Orwellian" and saying they felt as though they were "guilty until proven innocent"... The use of the Facewatch technology looks set to quickly expand, with Sainsbury's recently announcing plans to increase its use from 55 stores to more than 200 by the end of the year. Facewatch said it alerted retailers almost 300,000 times that a "known repeat offender" had entered a store during the first six months of 2026, and that its system allowed staff to intervene "before theft, abuse or violence could occur or escalate"... [E]xperts argue the use of facial recognition technology in shops to catch shoplifters is disproportionate. Nuala Polo, the UK public policy lead at the Ada Lovelace Institute, which studies the impact of AI on society, said: "There are other, much less intrusive means that you can use to catch shoplifters where you don't need to be scanning millions of faces every day, virtually without consent...." The campaign group Big Brother Watch has criticised police for "inserting themselves into this cowboy operation" and said people would be matched against "a secret blacklist compiled by unaccountable businesses and private security guards". Read more of this story at Slashdot.

  • 10 Million Cubans Suffer Nationwide Blackout - For The Second Time This Week
    by EditorDavid on 12/07/2026 at 3:52 am

    The Associated Press reports: An islandwide blackout struck Cuba on Friday for the second time this week as the nation of nearly 10 million people grapples with a crumbling power grid and fuel shortages stemming from a U.S. energy blockade... Authorities reported that they have already begun restoring power to some areas. On Monday, another massive blackout affected nearly 10 million people nationwide. Authorities reported during the week that service was gradually being restored from that outage. "While total blackouts have become increasingly common in the Caribbean country, it's unusual for back-to-back ones to hit just days apart..." Read more of this story at Slashdot.

  • Meta Removes Controversial AI Feature On Instagram After Backlash
    by EditorDavid on 12/07/2026 at 1:52 am

    "Meta has axed a controversial feature that allowed users to modify photos from public Instagram accounts using AI," reports TechCrunch: The feature, which wasn't designed to alert a user if their photos were used in this way, prompted immediate backlash... The company issued a blog post Friday announcing that it was removing the feature. Puck News founding partner Dylan Byers was the first to share the company's decision... Byers notes that the decision to do away with the feature came "amid scrutiny from users and talent agencies, including CAA." Read more of this story at Slashdot.

  • People Keep Sneaking Into an Empty IBM Campus - and Then Getting Arrested
    by EditorDavid on 11/07/2026 at 10:47 pm

    Since February, New York state police have arrested 48 people for trespassing on a former IBM campus in Somers, New York, reports the Wall Street Journal. 30 of the arrests were teenagers. The long-vacant site has become a magnet for so-called urban explorers, who prowl abandoned malls, hospitals, power plants, amusement parks, factories and any other disused structure they can breach... [I]t's been turbocharged by artsy videos on Instagram and TikTok that spur others to create their own posts, luring still more curiosity seekers... In Somers, social-media images of the old IBM campus — a sprawling, pyramid-studded 1980s complex designed by the late I.M. Pei's firm — show dystopian scenes: busted windows, tossed rooms and graffitied walls. But they also give eerie glimpses of conference rooms and cubicles unchanged since IBM left a decade ago, as if employees had fled the daily grind one day and never returned... One man in his mid-20s faces felony charges; police allege he had a loaded 9mm gun and took a Sony camera and power strip among other souvenirs. Andrew Proto, a defense lawyer, said "a 15-second clip" isn't worth a criminal record... Proto said he has represented or advised several minors arrested on the campus. The Somers town court clerk said some defendants received a 6-month "adjournment in contemplation of dismissal," meaning charges will be dropped and their arrest sealed if they avoid trouble. Some explorers who have posted about the IBM site say they follow an observe-and-preserve ethos and reject vandalism. They say they're driven by curiosity, the thrill of roaming forbidden spaces and a zeal to document discoveries — and that they're careful and know their limits. "It actually gives me hope when I hear that kids are out there getting into trouble," says Bradley Garrett, a cultural geographer and author of the book "Explore Everything: Place-Hacking the City," about his own urbex adventures. He sees urban exploration as "a gateway drug in a good way, sometimes, into intellectual curiosity about history and culture." But Garrett said popular spots can be "loved to death" online — and then shut down, looted or set ablaze. "Trespassers were blamed for a March 30 fire, reports a local newspaper, "that damaged one of the buildings and required volunteer firefighters to spend three hours extinguishing the blaze." Read more of this story at Slashdot.

  • How the FSF Sysadmins are Blocking Botnets with reaction
    by EditorDavid on 11/07/2026 at 9:47 pm

    For nearly two years the Free Software Foundation has been fighting web crawlers (including many aggressively scraping training data for AI models). A botnet controlling about five million IPs hit one system for six months in 2025. Their systems administrator wrote this week that they view these as distributed denial-of-service attacks. How are they fighting back? We noticed patterns in the scrapers that were abnormal, which gave us material for writing regular expressions. Searching for the regular expression then gave us a large lists of IP addresses. Looking up the origin of those IP addresses revealed that some of the crawlers were using botnets of residential IP addresses to scrape faster and avoid detection. We looked for what kinds of botnets might be generating the kind of traffic that we were seeing, and one that we suspected was called the "Vo1d" botnet, comprised of smart TVs running some sort of compromised app... We got confirmation that at least some of the botnet traffic hitting GNU Savannah was originating through the Vo1d/Popa botnet. We placed our regular expressions in fail2ban, and found that we were hitting the maximum rules that could be added to UFW firewall rules on our systems which showed degradation around 65,000 rules... We learned about ipset and configured fail2ban to add IP addresses that it found to IP sets. Using ipset, we kept building larger IP sets and did not find instability with as large as five million rules... We eventually found a promising project on Framasoft's forge Framagit called reaction written by ppom... After we ran into scaling issues with our initial implementation, we developed a much faster implementation where the reaction shutdown process would export the IP sets to disk and the reaction startup process would restore the IP sets. This allowed us to have nearly instantaneous restarts of the service to apply new rules. We published both of our configurations upstream to reaction's wiki so that everyone can benefit from it. reaction's getting started documentation now leads to the method that we proposed... Many sysadmins know about fail2ban, but not enough people know about reaction. I am very grateful to ppom for the help they have provided and for the tremendous project they have released to the world with reaction. We have implemented other defenses as well, but reaction is doing the majority of the automated work keeping our sites online. Read more of this story at Slashdot.

  • DuckDuckGo's Browser Now Blocks Most YouTube Ads
    by EditorDavid on 11/07/2026 at 8:47 pm

    Nerds.xyz reports: DuckDuckGo just gave its browser a feature that a lot of people have been waiting for. The privacy-focused browser can now block most video ads on YouTube, letting users watch videos without sitting through the pre-roll and mid-roll interruptions that have become part of everyday life on the platform. The feature is already enabled by default for iPhone, Windows, and Mac users running the latest version of the browser. Android users can turn it on manually... with DuckDuckGo planning to enable it by default in a future update... To make it work, DuckDuckGo relies on the same community-maintained filter lists used by uBlock Origin, along with some of its own compatibility rules. The company says you might notice a bit of extra buffering before a video starts, but once playback begins, most ads should be gone. Slashdot reader BrianFagioli argues that the feature raises questions about how creators are compensated when ad revenue is bypassed. Read more of this story at Slashdot.

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