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Beginner-friendly guides, organized by audience. Every guide shows its sources, publication date, and update date.
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Start here
Passwords, updates, backups — the first steps, in one place.
See the guides →For individuals & families
Phones, passwords, phishing protection, and more.
See the guides →For workplaces
SECURITY ACTION, employee accounts, ransomware readiness, and more.
See the guides →All guides
Start here
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.
Read more → For workplacesSECURITY ACTION One Star and Two Stars: How to Declare and What to Prepare
The difference between one star and two stars, the concrete steps to a declaration, and the points where many companies stumble — organized from IPA's official information.
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Planned
Ransomware Readiness: The First Five Points
For workplaces
Planned
Former-Employee Accounts and ID Management
For workplaces