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The most popular blog posts about security & privacy on Hacker News. 4,441 posts.
This document describes how Fil-C supports longjmp , setjmp , setcontext , getcontext , makecontext , and swapcontext in a totally memory-safe way. In particular, no misuse of those APIs in Fil-C can lead to stack corruption or any other violation of Fil-C's capability model.
Why are more security teams adopting Firecracker? How secure is it, and how suitable is it for your organization? This guide dives into this trending innovation.
Encryption is not a crime, encryption protects us all. Encryption, and especially end-to-end encryption, is an essential tool to protect everyone online. Attempts to undermine encryption are an attack to our fundamental right to privacy and an attack to our inherent right to security and safety.
Schools are increasingly adopting surveillance technology to spy on students while they’re at school, at home, or even on their social media. The companies that make these surveillance products and services advertise them to schools as a way to keep students safe–but there’s no evidence so far that they actually...
It is no secret that we at CloudFlare love Go. We use it, and we use it a LOT. There are many things to love about Go, but what I personally find appealing is the ability to write assembly code!
Guest Post: New off-path TCP hijacking attack in Wi-Fi networks that exploits vulnerabilities in the NAT mapping strategies of routers discovered.
Author: Dylan DuncanA new phishing tactic utilizing Google...
Identity, SEO, HTML5, and not having your content modified
From April 2026, only verified devices can send or receive end-to-end encrypted message on Element.
We ran experimental TLS blocking measurements in India
Software Freedom Conservancy congratulates its phpMyAdmin project on succesfuly completing completing a thorough security audit, as part of Mozilla's Secure Open Source Fund . No serious issues were found in the phyMyAdmin codebase.
Reverse engineering an ATM skimmer discovered in the wild, analyzing its hardware and data exfiltration methods.
This month, CloudFlare and EFF pushed back against major music labels’ latest strategy to force Internet infrastructure companies like CloudFlare to become trademark and copyright enforcers, by challenging a broad court order that the labels obtained in secret. Unfortunately, the court denied...
Proton Mail official clarification about Huawei partnership.
TL;DR Introduction I first encountered the chatbot as a normal Eurostar customer while planning a trip. When it opened, it clearly told me that “the answers in this chatbot are generated by AI”, which is good disclosure but immediately raised my curiosity about how it worked and what its limits were. Eurostar…
Update July 10th: Last week Monday, prosecution stated that they will keep our things for further analysis, even after explicitly confirming to journalists that they are aware that our only connection to Riseup is the collection of donations. This includes items belonging to our partners, and other third parties like…
Our investigation uncovers two sophisticated telecom surveillance campaigns and, for the first time, links real-world attack traffic to mobile operator signalling infrastructure. The findings expose how suspected commercial surveillance vendors (CSVs) exploit the global telecom interconnect ecosystem, leverage private…
The Zcash blockchain is live! We released the genesis block this morning, and people all around our planet have begun mining and transacting on it. Our homepage links to a download page where you can…
A look inside the gray-market reseller economy that gives mainland China cheap, structured, B2B-grade access to OpenAI, Anthropic, Google, and beyond
Discover how AWS’s Account Assessment tool introduced a serious security risk through its default deployment guidance & key steps to detect & remediate it.
We asked one of our top 10 hacker contributors, Johan Carlsson, to share his novel approach to bug bounty hunting.
Learn the importance of SPF, DKIM, DMARC, and BIMI in ensuring email delivery.
On August 21, 2025, an influx of traffic directed toward clients hosted in AWS us-east-1 caused severe congestion on links between Cloudflare and us-east-1. In this post, we explain what the failure was, why it occurred, and what we’re doing to make sure this doesn’t happen again.
