Post Syndicated from Bruce Schneier original https://www.schneier.com/blog/archives/2023/01/remote-vulnerabilities-in-automobiles.html
This group has found a ton of remote vulnerabilities in all sorts of automobiles.
It’s enough to make you want to buy a car that is not Internet-connected. Unfortunately, that seems to be impossible.
Post Syndicated from Bruce Schneier original https://www.schneier.com/blog/archives/2023/01/decarbonizing-cryptocurrencies-through-taxation.html
Maintaining bitcoin and other cryptocurrencies causes about 0.3 percent of global CO2 emissions. That may not sound like a lot, but it’s more than the emissions of Switzerland, Croatia, and Norway combined. As many cryptocurrencies crash and the FTX bankruptcy moves into the litigation stage, regulators are likely to scrutinize the cryptocurrency world more than ever before. This presents a perfect opportunity to curb their environmental damage.
The good news is that cryptocurrencies don’t have to be carbon intensive. In fact, some have near-zero emissions. To encourage polluting currencies to reduce their carbon footprint, we need to force buyers to pay for their environmental harms through taxes.
The difference in emissions among cryptocurrencies comes down to how they create new coins. Bitcoin and other high emitters use a system called “proof of work“: to generate coins, participants, or “miners,” have to solve math problems that demand extraordinary computing power. This allows currencies to maintain their decentralized ledger—the blockchain—but requires enormous amounts of energy.
Greener alternatives exist. Most notably, the “proof of stake” system enables participants to maintain their blockchain by depositing cryptocurrency holdings in a pool. When the second-largest cryptocurrency, Ethereum, switched from proof of work to proof of stake earlier this year, its energy consumption dropped by more than 99.9% overnight.
Bitcoin and other cryptocurrencies probably won’t follow suit unless forced to, because proof of work offers massive profits to miners—and they’re the ones with power in the system. Multiple legislative levers could be used to entice them to change.
The most blunt solution is to ban cryptocurrency mining altogether. China did this in 2018, but it only made the problem worse; mining moved to other countries with even less efficient energy generation, and emissions went up. The only way for a mining ban to meaningfully reduce carbon emissions is to enact it across most of the globe. Achieving that level of international consensus is, to say the least, unlikely.
A second solution is to prohibit the buying and selling of proof-of-work currencies. The European Parliament’s Committee on Economic and Monetary Affairs considered making such a proposal, but voted against it in March. This is understandable; as with a mining ban, it would be both viewed as paternalistic and difficult to implement politically.
Employing a tax instead of an outright ban would largely skirt these issues. As with taxes on gasoline, tobacco, plastics, and alcohol, a cryptocurrency tax could reduce real-world harm by making consumers pay for it.
Most ways of taxing cryptocurrencies would be inefficient, because they’re easy to circumvent and hard to enforce. To avoid these pitfalls, the tax should be levied as a fixed percentage of each proof-of-work-cryptocurrency purchase. Cryptocurrency exchanges should collect the tax, just as merchants collect sales taxes from customers before passing the sum on to governments. To make it harder to evade, the tax should apply regardless of how the proof-of-work currency is being exchanged—whether for a fiat currency or another cryptocurrency. Most important, any state that implements the tax should target all purchases by citizens in its jurisdiction, even if they buy through exchanges with no legal presence in the country.
This sort of tax would be transparent and easy to enforce. Because most people buy cryptocurrencies from one of only a few large exchanges—such as Binance, Coinbase, and Kraken—auditing them should be cheap enough that it pays for itself. If an exchange fails to comply, it should be banned.
Even a small tax on proof-of-work currencies would reduce their damage to the planet. Imagine that you’re new to cryptocurrency and want to become a first-time investor. You’re presented with a range of currencies to choose from: bitcoin, ether, litecoin, monero, and others. You notice that all of them except ether add an environmental tax to your purchase price. Which one do you buy?
Countries don’t need to coordinate across borders for a proof-of-work tax on their own citizens to be effective. But early adopters should still consider ways to encourage others to come on board. This has precedent. The European Union is trying to influence global policy with its carbon border adjustments, which are designed to discourage people from buying carbon-intensive products abroad in order to skirt taxes. Similar rules for a proof-of-work tax could persuade other countries to adopt one.
Of course, some people will try to evade the tax, just as people evade every other tax. For example, people might buy tax-free coins on centralized exchanges and then swap them for polluting coins on decentralized exchanges. To some extent, this is inevitable; no tax is perfect. But the effort and technical know-how needed to evade a proof-of-work tax will be a major deterrent.
Even if only a few countries implement this tax—and even if some people evade it—the desirability of bitcoin will fall globally, and the environmental benefit will be significant. A high enough tax could also cause a self-reinforcing cycle that will drive down these cryptocurrencies’ prices. Because the value of many cryptocurrencies rely largely on speculation, they are dependent on future buyers. When speculators are deterred by the tax, the lack of demand will cause the price of bitcoin to fall, which could prompt more current holders to sell—further lowering prices and accelerating the effect. Declining prices will pressure the bitcoin community to abandon proof of work altogether.
Taxing proof-of-work exchanges might hurt them in the short run, but it would not hinder blockchain innovation. Instead, it would redirect innovation toward greener cryptocurrencies. This is no different than how government incentives for electric vehicles encourage carmakers to improve green alternatives to the internal combustion engine. These incentives don’t restrict innovation in automobiles—they promote it.
Taxing environmentally harmful cryptocurrencies can gain support across the political spectrum, from people with varied interests. It would benefit blockchain innovators and cryptocurrency researchers by shifting focus from environmental harm to beneficial uses of the technology. It has the potential to make our planet significantly greener. It would increase government revenues.
Even bitcoin maximalists have reason to embrace the proposal: it would offer the bitcoin community a chance to prove it can survive and grow sustainably.
This essay was written with Christos Porios, and previously appeared in the Atlantic.
Post Syndicated from Bruce Schneier original https://www.schneier.com/blog/archives/2023/01/breaking-rsa-with-a-quantum-computer.html
A group of Chinese researchers have just published a paper claiming that they can—although they have not yet done so—break 2048-bit RSA. This is something to take seriously. It might not be correct, but it’s not obviously wrong.
We have long known from Shor’s algorithm that factoring with a quantum computer is easy. But it takes a big quantum computer, on the orders of millions of qbits, to factor anything resembling the key sizes we use today. What the researchers have done is combine classical lattice reduction factoring techniques with a quantum approximate optimization algorithm. This means that they only need a quantum computer with 372 qbits, which is well within what’s possible today. (The IBM Osprey is a 433-qbit quantum computer, for example. Others are on their way as well.)
The Chinese group didn’t have that large a quantum computer to work with. They were able to factor 48-bit numbers using a 10-qbit quantum computer. And while there are always potential problems when scaling something like this up by a factor of 50, there are no obvious barriers.
Honestly, most of the paper is over my head—both the lattice-reduction math and the quantum physics. And there’s the nagging question of why the Chinese government didn’t classify this research. But…wow…maybe…and yikes! Or not.
“Factoring integers with sublinear resources on a superconducting quantum processor”
Abstract: Shor’s algorithm has seriously challenged information security based on public key cryptosystems. However, to break the widely used RSA-2048 scheme, one needs millions of physical qubits, which is far beyond current technical capabilities. Here, we report a universal quantum algorithm for integer factorization by combining the classical lattice reduction with a quantum approximate optimization algorithm (QAOA). The number of qubits required is O(logN/loglogN ), which is sublinear in the bit length of the integer N , making it the most qubit-saving factorization algorithm to date. We demonstrate the algorithm experimentally by factoring integers up to 48 bits with 10 superconducting qubits, the largest integer factored on a quantum device. We estimate that a quantum circuit with 372 physical qubits and a depth of thousands is necessary to challenge RSA-2048 using our algorithm. Our study shows great promise in expediting the application of current noisy quantum computers, and paves the way to factor large integers of realistic cryptographic significance.
In email, Roger Grimes told me: “Apparently what happened is another guy who had previously announced he was able to break traditional asymmetric encryption using classical computers…but reviewers found a flaw in his algorithm and that guy had to retract his paper. But this Chinese team realized that the step that killed the whole thing could be solved by small quantum computers. So they tested and it worked.”
EDITED TO ADD: One of the issues with the algorithm is that it relies on a recent factoring paper by Claus Schnorr. It’s a controversial paper; and despite the “this destroys the RSA cryptosystem” claim in the abstract, it does nothing of the sort. Schnorr’s algorithm works well with smaller moduli—around the same order as ones the Chinese group has tested—but falls apart at larger sizes. At this point, nobody understands why. The Chinese paper claims that their quantum techniques get around this limitation (I think that’s what’s behind Grimes’s comment) but don’t give any details—and they haven’t tested it with larger moduli. So if it’s true that the Chinese paper depends on this Schnorr technique that doesn’t scale, the techniques in this Chinese paper won’t scale, either. (On the other hand, if it does scale then I think it also breaks a bunch of lattice-based public-key cryptosystems.)
I am much less worried that this technique will work now. But this is something the IBM quantum computing people can test right now.
EDITED TO ADD (1/4): A reporter just asked me my gut feel about this. I replied that I don’t think this will break RSA. Several times a year the cryptography community received “breakthroughs” from people outside the community. That’s why we created the RSA Factoring Challenge: to force people to provide proofs of their claims. In general, the smart bet is on the new techniques not working. But someday, that bet will be wrong. Is it today? Probably not. But it could be. We’re in the worst possible position right now: we don’t have the facts to know. Someone needs to implement the quantum algorithm and see.
EDITED TO ADD (1/5): Scott Aaronson’s take is a “no”:
In the new paper, the authors spend page after page saying-without-saying that it might soon become possible to break RSA-2048, using a NISQ (i.e., non-fault-tolerant) quantum computer. They do so via two time-tested strategems:
- the detailed exploration of irrelevancies (mostly, optimization of the number of qubits, while ignoring the number of gates), and
- complete silence about the one crucial point.
Then, finally, they come clean about the one crucial point in a single sentence of the Conclusion section:
It should be pointed out that the quantum speedup of the algorithm is unclear due to the ambiguous convergence of QAOA.
“Unclear” is an understatement here. It seems to me that a miracle would be required for the approach here to yield any benefit at all, compared to just running the classical Schnorr’s algorithm on your laptop. And if the latter were able to break RSA, it would’ve already done so.
All told, this is one of the most actively misleading quantum computing papers I’ve seen in 25 years, and I’ve seen … many.
EDITED TO ADD (1/7): More commentary. Again: no need to panic.
EDITED TO ADD (1/12): Peter Shor has suspicions.
Post Syndicated from Bruce Schneier original https://www.schneier.com/blog/archives/2022/12/friday-squid-blogging-grounded-fishing-boat-carrying-16000-pounds-of-squid.html
Rough seas are hampering efforts to salvage the boat:
The Speranza Marie, carrying 16,000 pounds of squid and some 1,000 gallons of diesel fuel, hit the shoreline near Chinese Harbor at about 2 a.m. on Dec. 15.
Six crew members were on board, and all were rescued without injury by another fishing boat.
[…]
However, large swells caused by the recent storm caused the Speranza Marie to pull loose from it anchored position and drift about 100 yards from from its original grounded location in Chinese Harbor, according to the Coast Guard.
As usual, you can also use this squid post to talk about the security stories in the news that I haven’t covered.
Read my blog posting guidelines here.
Post Syndicated from Bruce Schneier original https://www.schneier.com/blog/archives/2022/12/recovering-smartphone-voice-from-the-accelerometer.html
Yet another smartphone side-channel attack: “EarSpy: Spying Caller Speech and Identity through Tiny Vibrations of Smartphone Ear Speakers“:
Abstract: Eavesdropping from the user’s smartphone is a well-known threat to the user’s safety and privacy. Existing studies show that loudspeaker reverberation can inject speech into motion sensor readings, leading to speech eavesdropping. While more devastating attacks on ear speakers, which produce much smaller scale vibrations, were believed impossible to eavesdrop with zero-permission motion sensors. In this work, we revisit this important line of reach. We explore recent trends in smartphone manufacturers that include extra/powerful speakers in place of small ear speakers, and demonstrate the feasibility of using motion sensors to capture such tiny speech vibrations. We investigate the impacts of these new ear speakers on built-in motion sensors and examine the potential to elicit private speech information from the minute vibrations. Our designed system EarSpy can successfully detect word regions, time, and frequency domain features and generate a spectrogram for each word region. We train and test the extracted data using classical machine learning algorithms and convolutional neural networks. We found up to 98.66% accuracy in gender detection, 92.6% detection in speaker detection, and 56.42% detection in digit detection (which is 5X more significant than the random selection (10%)). Our result unveils the potential threat of eavesdropping on phone conversations from ear speakers using motion sensors.
It’s not great, but it’s an impressive start.
Post Syndicated from Bruce Schneier original https://www.schneier.com/blog/archives/2022/12/qr-code-scam.html
An enterprising individual made fake parking tickets with a QR code for easy payment.
Post Syndicated from Bruce Schneier original https://www.schneier.com/blog/archives/2022/12/arresting-it-administrators.html
This is one way of ensuring that IT keeps up with patches:
Albanian prosecutors on Wednesday asked for the house arrest of five public employees they blame for not protecting the country from a cyberattack by alleged Iranian hackers.
Prosecutors said the five IT officials of the public administration department had failed to check the security of the system and update it with the most recent antivirus software.
The next step would be to arrest managers at software companies for not releasing patches fast enough. And maybe programmers for writing buggy code. I don’t know where this line of thinking ends.
Post Syndicated from Bruce Schneier original https://www.schneier.com/blog/archives/2022/12/lastpass-breach.html
Last August, LastPass reported a security breach, saying that no customer information—or passwords—were compromised. Turns out the full story is worse:
While no customer data was accessed during the August 2022 incident, some source code and technical information were stolen from our development environment and used to target another employee, obtaining credentials and keys which were used to access and decrypt some storage volumes within the cloud-based storage service.
[…]
To date, we have determined that once the cloud storage access key and dual storage container decryption keys were obtained, the threat actor copied information from backup that contained basic customer account information and related metadata including company names, end-user names, billing addresses, email addresses, telephone numbers, and the IP addresses from which customers were accessing the LastPass service.
The threat actor was also able to copy a backup of customer vault data from the encrypted storage container which is stored in a proprietary binary format that contains both unencrypted data, such as website URLs, as well as fully-encrypted sensitive fields such as website usernames and passwords, secure notes, and form-filled data.
That’s bad. It’s not an epic disaster, though.
These encrypted fields remain secured with 256-bit AES encryption and can only be decrypted with a unique encryption key derived from each user’s master password using our Zero Knowledge architecture. As a reminder, the master password is never known to LastPass and is not stored or maintained by LastPass.
So, according to the company, if you chose a strong master password—here’s my advice on how to do it—your passwords are safe. That is, you are secure as long as your password is resilient to a brute-force attack. (That they lost customer data is another story….)
Fair enough, as far as it goes. My guess is that many LastPass users do not have strong master passwords, even though the compromise of your encrypted password file should be part of your threat model. But, even so, note this unverified tweet:
I think the situation at @LastPass may be worse than they are letting on. On Sunday the 18th, four of my wallets were compromised. The losses are not significant. Their seeds were kept, encrypted, in my lastpass vault, behind a 16 character password using all character types.
If that’s true, it means that LastPass has some backdoor—possibly unintentional—into the password databases that the hackers are accessing. (Or that @Cryptopathic’s “16 character password using all character types” is something like “P@ssw0rdP@ssw0rd.”)
My guess is that we’ll learn more during the coming days. But this should serve as a cautionary tale for anyone who is using the cloud: the cloud is another name for “someone else’s computer,” and you need to understand how much or how little you trust that computer.
If you’re changing password managers, look at my own Password Safe. Its main downside is that you can’t synch between devices, but that’s because I don’t use the cloud for anything.
News articles. Slashdot thread.
EDITED TO ADD: People choose lousy master passwords.
Post Syndicated from Bruce Schneier original https://www.schneier.com/blog/archives/2022/12/friday-squid-blogging-injured-giant-squid-and-paddleboarder.html
Here’s a video—I don’t know where it’s from—of an injured juvenile male giant squid grabbing on to a paddleboard.
As usual, you can also use this squid post to talk about the security stories in the news that I haven’t covered.
Read my blog posting guidelines here.
Post Syndicated from Bruce Schneier original https://www.schneier.com/blog/archives/2022/12/hacking-the-jfk-airport-taxi-dispatch-system.html
Two men have been convicted of hacking the taxi dispatch system at the JFK airport. This enabled them to reorder the taxis on the list; they charged taxi drivers $10 to cut the line.
Post Syndicated from Bruce Schneier original https://www.schneier.com/blog/archives/2022/12/critical-microsoft-code-execution-vulnerability.html
A critical code-execution vulnerability in Microsoft Windows was patched in September. It seems that researchers just realized how serious it was (and is):
Like EternalBlue, CVE-2022-37958, as the latest vulnerability is tracked, allows attackers to execute malicious code with no authentication required. Also, like EternalBlue, it’s wormable, meaning that a single exploit can trigger a chain reaction of self-replicating follow-on exploits on other vulnerable systems. The wormability of EternalBlue allowed WannaCry and several other attacks to spread across the world in a matter of minutes with no user interaction required.
But unlike EternalBlue, which could be exploited when using only the SMB, or server message block, a protocol for file and printer sharing and similar network activities, this latest vulnerability is present in a much broader range of network protocols, giving attackers more flexibility than they had when exploiting the older vulnerability.
[…]
Microsoft fixed CVE-2022-37958 in September during its monthly Patch Tuesday rollout of security fixes. At the time, however, Microsoft researchers believed the vulnerability allowed only the disclosure of potentially sensitive information. As such, Microsoft gave the vulnerability a designation of “important.” In the routine course of analyzing vulnerabilities after they’re patched, Palmiotti discovered it allowed for remote code execution in much the way EternalBlue did. Last week, Microsoft revised the designation to critical and gave it a severity rating of 8.1, the same given to EternalBlue.
Post Syndicated from Bruce Schneier original https://www.schneier.com/blog/archives/2022/12/ukraine-intercepting-russian-soldiers-cell-phone-calls.html
They’re using commercial phones, which go through the Ukrainian telecom network:
“You still have a lot of soldiers bringing cellphones to the frontline who want to talk to their families and they are either being intercepted as they go through a Ukrainian telecommunications provider or intercepted over the air,” said Alperovitch. “That doesn’t pose too much difficulty for the Ukrainian security services.”
[…]
“Security has always been a mess, both in the army and among defence officials,” the source said. “For example, in 2013 they tried to get all the staff at the ministry of defence to replace our iPhones with Russian-made Yoto smartphones.
“But everyone just kept using the iPhone as a second mobile because it was much better. We would just keep the iPhone in the car’s glove compartment for when we got back from work. In the end, the ministry gave up and stopped caring. If the top doesn’t take security very seriously, how can you expect any discipline in the regular army?”
This isn’t a new problem and it isn’t a Russian problem. Here’s a more general article on the problem from 2020.
Post Syndicated from Bruce Schneier original https://www.schneier.com/blog/archives/2022/12/trojaned-windows-installer-targets-ukraine.html
Mandiant is reporting on a trojaned Windows installer that targets Ukrainian users. The installer was left on various torrent sites, presumably ensnaring people downloading pirated copies of the operating system:
Mandiant uncovered a socially engineered supply chain operation focused on Ukrainian government entities that leveraged trojanized ISO files masquerading as legitimate Windows 10 Operating System installers. The trojanized ISOs were hosted on Ukrainian- and Russian-language torrent file sharing sites. Upon installation of the compromised software, the malware gathers information on the compromised system and exfiltrates it. At a subset of victims, additional tools are deployed to enable further intelligence gathering. In some instances, we discovered additional payloads that were likely deployed following initial reconnaissance including the STOWAWAY, BEACON, and SPAREPART backdoors.
One obvious solution would be for Microsoft to give the Ukrainians Windows licenses, so they don’t have to get their software from sketchy torrent sites.
Post Syndicated from Bruce Schneier original https://www.schneier.com/blog/archives/2022/12/how-to-surrender-to-a-drone.html
The Ukrainian army has released an instructional video explaining how Russian soldiers should surrender to a drone:
“Seeing the drone in the field of view, make eye contact with it,” the video instructs. Soldiers should then raise their arms and signal they’re ready to follow.
After that the drone will move up and down a few meters, before heading off at walking pace in the direction of the nearest representatives of Ukraine’s army, it says.
The video also warns that the drone’s battery may run low, in which case it will head back to base and the soldiers should stay put and await a fresh one.
That one, too, should be met with eye contact and arms raised, it says.
Incredible.
Post Syndicated from Bruce Schneier original https://www.schneier.com/blog/archives/2022/12/friday-squid-blogging-squid-in-concert.html
Squid is performing a concert in London in February.
If you don’t know what their music is like, try this or this or this.
As usual, you can also use this squid post to talk about the security stories in the news that I haven’t covered.
Read my blog posting guidelines here.
Post Syndicated from Bruce Schneier original https://www.schneier.com/blog/archives/2022/12/as-long-as-were-on-the-subject-of-captchas.html
There are these.
Post Syndicated from Bruce Schneier original https://www.schneier.com/blog/archives/2022/12/apple-patches-iphone-zero-day.html
The most recent iPhone update—to version 16.1.2—patches a zero-day vulnerability that “may have been actively exploited against versions of iOS released before iOS 15.1.”
News:
Apple said security researchers at Google’s Threat Analysis Group, which investigates nation state-backed spyware, hacking and cyberattacks, discovered and reported the WebKit bug.
WebKit bugs are often exploited when a person visits a malicious domain in their browser (or via the in-app browser). It’s not uncommon for bad actors to find vulnerabilities that target WebKit as a way to break into the device’s operating system and the user’s private data. WebKit bugs can be “chained” to other vulnerabilities to break through multiple layers of a device’s defenses.
Post Syndicated from Bruce Schneier original https://www.schneier.com/blog/archives/2022/12/a-security-vulnerability-in-the-kmsdbot-botnet.html
Security researchers found a software bug in the KmsdBot cryptomining botnet:
With no error-checking built in, sending KmsdBot a malformed command—like its controllers did one day while Akamai was watching—created a panic crash with an “index out of range” error. Because there’s no persistence, the bot stays down, and malicious agents would need to reinfect a machine and rebuild the bot’s functions. It is, as Akamai notes, “a nice story” and “a strong example of the fickle nature of technology.”
Post Syndicated from Bruce Schneier original https://www.schneier.com/blog/archives/2022/12/reimagining-democracy.html
Last week, I hosted a two-day workshop on reimagining democracy.
The idea was to bring together people from a variety of disciplines who are all thinking about different aspects of democracy, less from a “what we need to do today” perspective and more from a blue-sky future perspective. My remit to the participants was this:
The idea is to start from scratch, to pretend we’re forming a new country and don’t have any precedent to deal with. And that we don’t have any unique interests to perturb our thinking. The modern representative democracy was the best form of government mid-eighteenth century politicians technology could invent. The twenty-first century is a very different place technically, scientifically, and philosophically. What could democracy look like if it were reinvented today? Would it even be democracy—what comes after democracy?
Some questions to think about:
- Representative democracies were built under the assumption that travel and communications were difficult. Does it still make sense to organize our representative units by geography? Or to send representatives far away to create laws in our name? Is there a better way for people to choose collective representatives?
- Indeed, the very idea of representative government is due to technological limitations. If an AI system could find the optimal solution for balancing every voter’s preferences, would it still make sense to have representatives—or should we vote for ideas and goals instead?
- With today’s technology, we can vote anywhere and any time. How should we organize the temporal pattern of voting—and of other forms of participation?
- Starting from scratch, what is today’s ideal government structure? Does it make sense to have a singular leader “in charge” of everything? How should we constrain power—is there something better than the legislative/judicial/executive set of checks and balances?
- The size of contemporary political units ranges from a few people in a room to vast nation-states and alliances. Within one country, what might the smaller units be—and how do they relate to one another?
- Who has a voice in the government? What does “citizen” mean? What about children? Animals? Future people (and animals)? Corporations? The land?
- And much more: What about the justice system? Is the twelfth-century jury form still relevant? How do we define fairness? Limit financial and military power? Keep our system robust to psychological manipulation?
My perspective, of course, is security. I want to create a system that is resilient against hacking: one that can evolve as both technologies and threats evolve.
The format was one that I have used before. Forty-eight people meet over two days. There are four ninety-minute panels per day, with six people on each. Everyone speaks for ten minutes, and the rest of the time is devoted to questions and comments. Ten minutes means that no one gets bogged down in jargon or details. Long breaks between sessions and evening dinners allow people to talk more informally. The result is a very dense, idea-rich environment that I find extremely valuable.
It was amazing event. Everyone participated. Everyone was interesting. (Details of the event—emerging themes, notes from the speakers—are in the comments.) It’s a week later and I am still buzzing with ideas. I hope this is only the first of an ongoing series of similar workshops.
Post Syndicated from Bruce Schneier original https://www.schneier.com/blog/archives/2022/12/hacking-bostons-charliecard.html
Interesting discussion of vulnerabilities and exploits against Boston’s CharlieCard.