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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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  • Ukraine Is Jamming Russia's 'Superweapon' With a Song
    by BeauHD on 22/11/2025 at 10:00 am

    Longtime Slashdot reader fahrbot-bot shares a report from 404 Media: The Ukrainian Army is knocking a once-hyped Russian superweapon out of the sky by jamming it with a song and tricking it into thinking it's in Lima, Peru. The Kremlin once called its Kh-47M2 Kinzhal ballistic missiles "invincible." Joe Biden said the missile was "almost impossible to stop." Now Ukrainian electronic warfare experts say they can counter the Kinzhal with some music and a re-direction order. [...] Kinzhals and other guided munitions navigate by communicating with Russian satellites that are part of the GLONASS system, a GPS-style navigation network. Night Watch uses a jamming system called Lima EW to generate a disruption field that prevents anything in the area from communicating with a satellite. Many traditional jamming systems work by blasting receivers on munitions and aircraft with radio noise. Lima does that, but also sends along a digital signal and spoofs navigation signals. It "hacks" the receiver it's communicating with to throw it off course. Night Watch shared pictures of the downed Kinzhals with 404 Media that showed a missile with a controlled reception pattern antenna (CRPA), an active antenna that's meant to resist jamming and spoofing. "We discovered that this missile had pretty old type of technology," Night Watch said. "They had the same type of receivers as old Soviet missiles used to have. So there is nothing special, there is nothing new in those types of missiles." Night Watch told 404 Media that it used this Lima to take down 19 Kinzhals in the past two weeks. First, it replaces the missile's satellite navigation signals with the Ukrainian song "Our Father Is Bandera." Any digital noise or random signal would work to jam the navigation system, but Night Watch wanted to use the song because they think it's funny. "We just send a song... we just make it into binary code, you know, like 010101, and just send it to the Russian navigation system," Night Watch said. "It's just kind of a joke. [Bandera] is a Ukrainian nationalist and Russia tries to use this person in their propaganda to say all Ukrainians are Nazis. They always try to scare the Russian people that Ukrainians are, culturally, all the same as Bandera." Once the song hits, Night Watch uses Lima to spoof a navigation signal to the missiles and make them think they're in Lima, Peru. Once the missile's confused about its location, it attempts to change direction. These missiles are fast -- launched from a MiG-31 they can hit speeds of up to Mach 5.7 or more than 4,000 miles per hour -- and an object moving that fast doesn't fare well with sudden changes of direction. Read more of this story at Slashdot.

  • Magician Forgets Password To His Own Hand After RFID Chip Implant
    by BeauHD on 22/11/2025 at 7:00 am

    A magician who implanted an RFID chip in his hand lost access to it after forgetting the password, leaving him effectively locked out of the tech embedded in his own body. The Register reports: "It turns out," said [said magician Zi Teng Wang], "that pressing someone else's phone to my hand repeatedly, trying to figure out where their phone's RFID reader is, really doesn't come off super mysterious and magical and amazing." Then there are the people who don't even have their phone's RFID reader enabled. Using his own phone would, in Zi's words, lack a certain "oomph." Oh well, how about making the chip spit out a Bitcoin address? "That literally never came up either." In the end, Zi rewrote the chip to link to a meme, "and if you ever meet me in person you can scan my chip and see the meme." It was all suitably amusing until the Imgur link Zi was using went down. Not everything on the World Wide Web is forever, and there is no guarantee that a given link will work indefinitely. Indeed, access to Imgur from the United Kingdom was abruptly cut off on September 30 in response to the country's age verification rules. Still, the link not working isn't the end of the world. Zi could just reprogram the chip again, right? Wrong. "When I went to rewrite the chip, I was horrified to realize I forgot the password that I had locked it with." The link eventually started working again, but if and when it stops, Zi's party piece will be a little less entertaining. He said: "Techie friends I've consulted with have determined that it's too dumb and simple to hack, the only way to crack it is to strap on an RFID reader for days to weeks, brute forcing every possible combination." Or perhaps some surgery to remove the offending hardware. Read more of this story at Slashdot.

  • Iran's Capital Is Moving. The Reason Is an Ecological Catastrophe
    by BeauHD on 22/11/2025 at 3:30 am

    An anonymous reader quotes a report from Scientific American: Amid a deepening ecological crisis and acute water shortage, Tehran can no longer remain the capital of Iran, the country's president has said. The situation in Tehran is the result of "a perfect storm of climate change and corruption," says Michael Rubin, a political analyst at the American Enterprise Institute. "We no longer have a choice," said Iranian president Masoud Pezeshkian during a speech on Thursday. Instead Iranian officials are considering moving the capital to the country's southern coast. But experts say the proposal does not change the reality for the nearly 10 million people who live in Tehran and are now suffering the consequences of a decades-long decline in water supply. Iran's capital has moved many times over the centuries, notes the report. "But this marks the first time the Iranian government has moved the capital because of an ecological catastrophe." Yet, Rubin says, "it would be a mistake to look at this only through the lens of climate change" and not factor in the water, land, and wastewater mismanagement and corruption that have made the crisis worse. Linda Shi, a social scientist and urban planner at Cornell University, says: "Climate change is not the thing that is causing it, but it is a convenient factor to blame in order to avoid taking responsibility" for poor political decisions. Read more of this story at Slashdot.

  • Cryptographers Cancel Election Results After Losing Decryption Key
    by BeauHD on 22/11/2025 at 2:02 am

    The International Association of Cryptologic Research (IACR) was forced to cancel its leadership election after a trustee lost their portion of the Helios voting system's decryption key, making it impossible to reveal or verify the final results. Ars Technica reports: The IACR said Friday that the votes were submitted and tallied using Helios, an open source voting system that uses peer-reviewed cryptography to cast and count votes in a verifiable, confidential, and privacy-preserving way. Helios encrypts each vote in a way that assures each ballot is secret. Other cryptography used by Helios allows each voter to confirm their ballot was counted fairly. "Unfortunately, one of the three trustees has irretrievably lost their private key, an honest but unfortunate human mistake, and therefore cannot compute their decryption share," the IACR said. "As a result, Helios is unable to complete the decryption process, and it is technically impossible for us to obtain or verify the final outcome of this election." The IACR will switch to a two-of-three private key system to prevent this sort of thing from happening again. Moti Yung, the trustee responsible for the incident, has resigned and is being replaced by Michael Abdalla. Read more of this story at Slashdot.

  • Google Starts Testing Ads In AI Mode
    by BeauHD on 22/11/2025 at 1:25 am

    Google has begun testing sponsored ads inside its Gemini-powered AI Mode, placing labeled "sponsored" links at the bottom of AI-generated responses. Engadget reports: [A] Google spokesperson says the result shown is akin to similar tests it's been running this year. "People seeing ads in AI Mode in the wild is simply part of Google's ongoing tests, which we've been running for several months," the spokesperson said. The push to start offering ads in AI Mode was announced in May. The company also told 9to5Google that there are no current plans to fully update AI Mode to incorporate ads. For now, the software seems to be prioritizing organic links over sponsored links, but we all know how insidious ads can be once the floodgates open... Read more of this story at Slashdot.

  • SEC Dismisses Case Against SolarWinds, Top Security Officer
    by BeauHD on 22/11/2025 at 12:45 am

    The SEC has officially dismissed its high-profile case against SolarWinds and its CISO that was tied to a Russia-linked cyberattack involving the software company. Reuters reports: The landmark case, which SEC brought in late 2023, rattled the cybersecurity community and later faced scrutiny from a judge who dismissed many of the charges. The SEC had said SolarWinds and its chief information security officer had violated U.S. securities laws by concealing vulnerabilities in connection with the high-profile 2020 Sunburst cyber attack. The SEC, SolarWinds and CISO Timothy Brown filed a motion on Thursday to dismiss the case with prejudice, according to a joint stipulation posted on the agency's website. A SolarWinds spokesperson said the firm is "clearly delighted" with the dismissal. "We hope this resolution eases the concerns many CISOs have voiced about this case and the potential chilling effect it threatened to impose on their work," the spokesperson said. Read more of this story at Slashdot.

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