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The best Security newsletters

5 newsletters, ranked by editorial quality and how recently they published. Looking for something more specific? Search instead.

CryptoSlate

Substack
cryptoslate.substack.com· daily· Published 2 days ago

A crypto news briefing that explains the day's most consequential stories, covering markets, regulation, security and protocol changes, with notes on what to watch next. Each issue includes sourced figures, dates and caveats on what remains unconfirmed.

crypto newsbitcoin pricezcashcrypto regulationetf flowshardware wallets
essentialeurope.substack.com· weekly· Published 3 days ago

A Substack covering European politics, migration, security and economics through a weekly news round-up and longer opinionated analyses. Readers get a strongly argued, right-leaning critical perspective on Western European governance alongside some explanatory reporting.

europeeuropean newsweekly roundupfrance protestsgermany migration policymerz
blog.levelupcoding.com· weekly· Published yesterday

A system design newsletter that explains architecture and engineering concepts, such as NGINX as a traffic boundary and how Slack built a multi-agent security investigator, in accessible prose. Issues also carry sponsored sections from vendors like Atlassian, Oracle and MongoDB.

system designnginxload balancingreverse proxyai agentsrag
defconalerts.com· daily· Published 2 days ago

Short alerts that relay government security notices and travel advisories, such as U.S. Embassy alerts and State Department advisory changes, for specific countries. Readers get quick, factual updates on unrest, crime and travel risk around the world.

travel advisoryus embassy alertsstate departmentsecurity alertscivil unrestcurfew
newsletter.betterstack.com· biweekly· Inactive for over a year

A weekly-style engineering digest that breaks down how large tech companies solve scaling and infrastructure problems, such as LinkedIn's GPU memory savings, Tinder's microservice security, and DoorDash's Redis read performance. Each issue explains the problem context, the approach the team took, and the basic concepts needed to follow it.

llm traininggpu memoryredismicroservicesapi gatewaytinder