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A quiet change to RSA
Over the course of years, RSA implementations gradually replaced Euler's totient function with Carmichael's totient function.
New
The latest blog posts to take off on Hacker News. 850 posts.
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PayPal to support Ethereum and Bitcoin
Send and receive money as easily as sending a text, across apps, borders, and currencies.
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Fully homomorphic encryption and the dawn of a private internet
This article is archived on mirror.xyz , and attracted discussion on Hacker News Generated by this notebooklm Gene Spafford "Using encryption on the…
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Opening up ‘Zero-Knowledge Proof’ technology
Today, we open sourced our Zero-Knowledge Proof (ZKP) libraries, fulfilling a promise and building on our partnership with Sparkasse to support EU age assurance.
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Why quadratic funding is not optimal
Introduction Quadratic funding has received a lot of attention recently as a mechanism for funding public goods. The Gitcoin grants program alone has distributed over $59M through QF funding rounds as of January 20241.\nQF is appealing because it is theoretically optimal under certain assumptions2. The problem is that…
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The Polymarket users betting on when Jesus will return
Thanks to Jesse Richardson for discussion. Polymarket asks: will Jesus Christ return in 2025? In the three days since the market opened, traders have wagered over $100,000 on this question. The mar…
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The cryptography behind passkeys
This post will examine the cryptography behind passkeys, the guarantees they do or do not give, and interesting cryptographic things you can do with them, such as generating cryptographic keys and storing certificates.
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$70M in 60 Seconds: How Insider Info Helped Someone 28x Their Money
On April 9, 2025, someone risked $2.5 million on SPY call options—and walked away with $70+ million in under an hour. The trade was placed at 1:01 pm. At 1:30 pm, Trump announced tariff pauses. The market exploded upward. These options that cost 85 cents were suddenly worth more than $25.
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The “strategic reserve” exposes crypto as the scam it always was
Today, President Trump announced that the US Government would begin using taxpayer dollars to systematically buy up a variety of cryptocurrencies. Crypto prices shot up on the news. This is revealing, as crypto boosters have argued for years that cryptocurrency has legitimate economic value as a payment system outside…
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The $1.5B Bybit Hack
The $1.5B Bybit Hack demonstrates how the Era of Operational Security Failures has arrived, and most cryptocurrency companies are not prepared for its implications.
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No Bitcoin ETFs at Vanguard (2024)
Vanguard's thought leaders share timely insights about international financial markets, investor behavior, and the investment industry.
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How Chainalysis made their way into popular Monero wallets
An investigation into how malicious nodes run by Chainalysis made their way into defaults of popular Monero wallets.
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Lazarus Group laundered $200M from 25 crypto hacks to fiat
Bluenoroff or APT38, more commonly referred to as Lazarus Group is a threat group which has been tied to the North Korean government since as early as 2009 primarily being financially motivated utilizing malware custom built for each target.
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Programming Zero Knowledge Proofs: From Zero to Hero
Learn to write and modify Zero Knowledge Proofs from scratch. You'll build a digital signature scheme using hash-based commitments, gaining practical ZKP programming skills and intuition along the way. By the end, you'll have all the tools you need to implement things like group signatures.
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“YOLO” is not a valid hash construction
Among the cryptographic missteps we see at Trail of Bits, “let’s build our own tool out of a hash function” is one of the most common. Clients have a problem along the lines of “we need to hash a bunch of different values together” or “we need a MAC” or “we need […]
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Quantum is unimportant to post-quantum
You might be hearing a lot about post-quantum (PQ) cryptography lately, and it’s easy to wonder why it’s such a big deal when nobody has actually seen a quantum computer. But even if a quantum computer is never built, new PQ standards are safer, more resilient, and more flexible than their classical […]
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Anatomy of a cryptocurrency scam
You receive a message. Now either you will be victim or not. Your knowledge, attention and moral compass will decide where you will end up.
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Sei pays out $2M bug bounty
In April 2024, I found and reported two critical bugs to Sei Network concerning their layer-1 blockchain. One of these issues impacted the chain’s availability, and the other its integrity. The Sei Foundation awarded me $75,000 and $2,000,000 respectively for these reports.
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Ethereum has blobs. Where do we go from here?
On March 13, the Dencun hard fork activated, enabling one of the long-awaited features of Ethereum: proto-danksharding (aka EIP-4844 , aka blobs). Initially, the fork reduced the transaction fees of rollups by a factor of over 100, as blobs were nearly free. In the last day, we finally saw blobs spike up in volume and…
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Post-quantum cryptography is too damn big
Large-scale quantum computers are capable of breaking all of the common forms of asymmetric cryptography used on the Internet today. Luckily, they don’t exist yet. The Internet-wide transition to post-quantum cryptography began in 2022 when NIST announced their final candidates for key exchange and signatures in the…
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EU Parliament commitee approves cash cap and ban on anonymous crypto payments
The majority of the EU Parliament's lead committees today approved far-reaching new anti-money laundering laws: Anonymous cash payments over €3,000 will be banned in commercial transactions. Cash payments over €10,000 will even be completely banned in business transactions. And anonymous payments in
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Google's threat model for post-quantum cryptography
Read on to understand how Google currently evaluates the threat landscape related to post-quantum cryptography, and what implications this has for migrating from classical cryptographic algorithms to PQC.
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Exodus Bitcoin Wallet: $490k swindle
Edit: There’s a short follow-up to this post: Exodus Bitcoin Wallet: Follow up. tl;dr: A Bitcoin investor was recently scammed out of 9 Bitcoin (worth around $490K) in a fake “Exodus wallet” desktop application for Linux, published in the Canonical Snap Store. This isn’t the first time, and if nothing changes, it…
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KYC. No, Thanks
KYC was sold as a way to stop criminals. In practice it excludes the unbanked, leaks personal data on dark web markets, and surveils everyone else.
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EU NGI TALER will bring private and secure online payments to the Eurozone
Taxable Anonymous Libre Electronic Reserves
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Filecoin Foundation Successfully Deploys IPFS in Space
Filecoin Foundation successfully deploys IPFS in space. Discover the details of this groundbreaking achievement.
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Carta to exit secondary trading business
No. Not anymore. Because we have the data, if we are trading secondaries, people will always worry that we are using the data, even if we…
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