GitHub CLI Cheatsheet
gh at a glance: authentication, repositories, pull requests, issues, GitHub Actions runs and secrets, releases, search, extensions, and the API.
authentication
Email Authentication Explained: SPF, DKIM, and DMARC
SPF, DKIM, and DMARC help prevent domain spoofing. See how each check works, what DMARC alignment requires, and how to verify the DNS records with dig.
Fix SSH "Host Key Verification Failed" Error
Resolve the SSH Host key verification failed error by removing the stale known_hosts entry with ssh-keygen -R after verifying the server is genuine.
How to Use OpenSSL: Generate Keys, Certificates, and Test TLS
Practical OpenSSL guide for Linux: generate private keys, create CSRs and self-signed certificates, convert formats, inspect certificates, and test TLS connections.
SSH certificates: the better SSH experience
When I ssh into a server for the first time, I’m confronted with a dialog which asks me to verify I’m actually talking to the machine I expect to be talking to. $ ssh -l jane 192.0.2.65 The authen...
SSH Hardening: Best Practices for Securing Your Server
Learn how to harden your SSH server with best practices including key-only authentication, disabling root login, changing the default port, and setting up Fail2Ban.
Understanding OAuth 2.1 for MCP (Model Context Protocol) Servers: Discovery, Authorization, and Access Phases
Learn about the OAuth 2.1 for MCP servers with secure authorization, PKCE, scopes, and client registration
An Illustrated Guide to OAuth
OAuth was first introduced in 2007.
Guide to Marketplace Payment Processing
By Mdu Sibisi One of the biggest challenges for modern e-commerce and fintech developers is building...
The not-app-building parts of building an app
Large customers require engineers to build several acronyms
Advanced Usages of Devise for Rails
In part one of this series, we introduced Devise using an example app to explore modules, helpers,...
An Introduction to Devise for Ruby on Rails
In part one of this series on Devise, we'll cover the basics of the Devise gem.
Passkeys may not be for you, but they are safe and easy—here’s why
Answering common questions about how passkeys work.
How to Setup Devise for User Authentication on Rails 7
If you are a frequent user of Ruby on Rails, you know that building authentication and user...
Passkeys: What They Are and Why You Need Them ASAP
Passkeys might be what finally puts an end to passwords for good. Here's how they work, where you can use them, and why they keep your accounts safe.
Rails Authentication From Scratch
If you’re like me then you probably take Devise for granted because you’re too intimidated to roll your own authentication system. As powerful as Devise is, it’s not perfect. There are plenty of cases where I’ve reached for it only to end up constrained by its features and…
How SPF, DKIM, DMARC Drive Email Delivery, Security
There's no shortage of crooks looking to impersonate an authentic email sender. These three authentication tools prevent that from happening while improving deliverability.
Lesson 8 - Devise Gem with Rails 7 & Hotwire
In this video I will show you how to create a simple authentication system using Rails 7 and Devise Gem. Learn how to create a global navbar that has conditional logic for user authentication. Reference the code here ! https://github.com/swiftruby/devisefromscratch
Hacker News
An introduction to Web Authentication (WebAuthn), the new API that can replace passwords with strong authentication.
Behavioral Profiling: The password you can't change
You can be identified by how you type, even behind proxies and Tor. Protect yourself with KeyboardPrivacy.