セキュリティ on Kaisekukun

Stop Reusing Passwords Today: The Beginner's Guide to Password Managers (2026)

Tue, 10 Feb 2026 18:40:00 +0000

The holiday season is over, and a new year of work has begun. Have you ever frozen at a login screen, realizing you have no idea what your password is?

Clicking “Forgot Password,” only to be told “You cannot use a previous password.” Adding random digits, then forgetting again… This password reset hell is a massive waste of time.

But reusing the same password everywhere is the modern equivalent of handing out copies of your house key to strangers.

Beyond ChatGPT: Why Local AI on Your Own PC Is the Breakthrough Trend of 2026

Thu, 01 Jan 2026 18:33:00 +0000

“I understand AI is useful, but I’m uneasy about entering sensitive work data…” “Monthly AI subscription fees are quietly eating into my budget.”

As generative AI becomes part of daily life, many users face these concerns. In 2026, the hottest trend in IT is Local AI (Local LLM) — running AI directly on your own PC without relying on cloud servers.

This guide explains what local AI is, how it differs from cloud-based AI, and why it is suddenly gaining traction.

5 Essential Steps to Secure Your WordPress Site from Hackers

Thu, 04 Dec 2025 07:00:00 +0000

“My blog is too small to be a target.” “Security sounds complicated, so I keep putting it off.”

If that is what you think, you could be in serious danger.

Malicious bots are constantly trying every WordPress site’s “doorknob” worldwide, 24/7. They do not distinguish between personal blogs and major sites. Any site with weak security is a target.

If your site gets hijacked, attackers could inject spam links, steal visitor data, or even delete your entire site. Years of hard work could vanish instantly.

My Number Card Now Supported on iPhone: Register in Apple Wallet from June 24

Fri, 06 Jun 2025 02:22:01 +0000

Hello!

Today, the Digital Agency of Japan officially announced that “My Number Card on iPhone” service will launch on June 24, 2025. This allows users to register their My Number Card in Apple Wallet, making government services more accessible and convenient.

My Number Card Now Available on iPhone

With this feature, iPhone users can access government services — such as logging into Myna Portal and obtaining certificates at convenience stores — without carrying a physical My Number Card. Facial recognition (Face ID) and fingerprint authentication (Touch ID) ensure secure and easy identity verification.

VPN Basics: How to Choose and Use the Best VPN Service for Security and Privacy

Tue, 14 Jan 2025 21:00:06 +0000

Hello! Today, we are taking a detailed look at VPNs — a technology you may have heard about but might not fully understand. VPNs are useful for protecting personal information and bypassing geographic restrictions. This guide explains the basics, benefits, and recommended services.

1. What Is a VPN?

How VPN Works

VPN (Virtual Private Network) creates a secure, encrypted “tunnel” over the internet. This tunnel protects your data from being intercepted by third parties. For example, using a VPN on public Wi-Fi prevents hackers from stealing your personal information.

The Complete Guide to Choosing and Using a Wi-Fi Router

Fri, 03 Jan 2025 22:00:00 +0000

Hello! Today, we are diving deep into the Wi-Fi router — an essential device for modern life. With smartphones, computers, game consoles, and even home appliances connecting to the internet, a good Wi-Fi environment is crucial. This guide covers how to choose the right router and get the most out of it.

1. Understanding Wi-Fi Router Basics

What Does a Wi-Fi Router Do?

A Wi-Fi router wirelessly delivers internet to devices throughout your home or office. Think of your internet connection as a highway; the router acts as the intersections and off-ramps that distribute traffic throughout your house. Choosing the right router reduces congestion and enables smooth communication.

Speed Up Your Internet by Updating Your Devices and Software

Thu, 19 Sep 2024 04:00:00 +0000

Hello!

Today, we focus on how updates can improve your internet speed. Outdated hardware and software are common causes of slow connections. This guide covers updating routers, devices, and software with specific steps.

Why Updates Matter

Outdated hardware and software suffer from reduced performance and increased security risks. Regular updates include bug fixes, performance optimizations, and security enhancements.

Enhanced security! Thorough explanation of how to install and use ZAP

Thu, 16 May 2024 12:00:00 +0000

Hello, I’m a new member of the OWASP ZAP team! Today I will explain in detail how to install and use ZAP (formerly known as OWASP ZAP), a tool to enhance web application security, and its advantages and disadvantages.

What is ZAP?

ZAP (Zed Attack Proxy) is an open source web application security scanner developed by OWASP (Open Web Application Security Project). It is used by developers and security professionals to check the security of web applications.