Start here

Passwords, updates, backups — the first steps, in one place.

Stop Reusing Passwords — The First Step

Why reusing the same password is dangerous (credential-stuffing / password-list attacks) and how to stop, step by step, based on official IPA and JPCERT/CC guidance.

About 3 min read · Beginner · Published： November 7, 2026

← Back to the guide list