Lessons from the React RCE Incident: Why HMAC Signatures, Key Rotation, and Zero Trust Matter

The React Server Components/Next.js RCE (CVE‑2025‑55182) demonstrates the dangers of unconditionally trusting client da…

Malicious Bots Won’t Stop—Let’s Cut Them Off at the Front with Nginx: Cleaning Up Weird URLs Early

When you expose a web application, malicious bots and scanners will bombard it with odd requests. This guide shows how …

Why Is Cloudflare Free? Understanding CDN Mechanics and the Business Model

Explore why Cloudflare offers free CDN and security services, the underlying business model, and how the free plan bene…

Safely Storing Secret Keys in Django Models (Fernet Edition)

Learn how to securely store API keys and secrets in Django using Fernet encryption. This guide covers key generation, s…

Is Your SSH Server Secure? A Deep Dive into SSH Server Logs for Hacking Signs

Learn how to identify hacking signs through SSH server logs, prevent brute-force attacks, and failures in password logi…

SSH: A Complete Guide from Concepts to Practical Security Settings

This post provides a step-by-step guide on the fundamental concepts of SSH and practical security settings that you can…

Essential Knowledge for SPA and React - A Complete Guide to Browser Storage

A comprehensive guide on utilizing browser storage (session storage, local storage, IndexedDB, etc.) for SPA and React …

Django's HTTP Utility - 'django.utils.http'

This post introduces how to implement URL encoding, safe token transmission, and redirection security using Django's `d…

Why Running a Container as Root Is Not Recommended?

Running containers as root poses significant security risks. This article discusses the possibilities of gaining host r…

Reasons to Hide Admin Right Now

This post summarizes the reasons and methods for immediately hiding the admin interface of Django. It serves as a pract…

How to Use Django's get_valid_filename Function

Learn how to safely convert filenames using Django's get_valid_filename function along with practical examples.

Implementing One-Time Tokens and the Pitfalls of `max_age` in Django Signing

This post introduces the limitations of `django.core.signing` and provides examples for implementing one-time tokens us…

Web Crawling Bots: Distinguishing Beneficial Entities from Harmful Intruders

Over half of the traffic to websites is generated by bots. Learn how to differentiate between beneficial search engine …

First Steps in Automating SSH Connections: Mastering the Config File

Manage your frequently used SSH connection information like bookmarks with the .ssh/config file! This practical guide i…

Effective Operation of Fail2Ban: Practical Security Strategies to Avoid Excessive IP Banning

Banning 1,100 IPs in 3 weeks? Fail2Ban's effectiveness is strong, but excessive settings can slow down the server. Disc…