Howto作成aStrongパスワードin2026(andtheMistakesEveryoneMakes)
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How to Create a Strong Password in 2026 — and the Mistakes Everyone Makes
The 2026 threat landscape
- Cloud GPU farms now crack 12-char complex passwords in hours for under $5.
- AI-assisted phishing generates personalized lures at scale — passwords alone no longer suffice.
- Quantum-resistant algorithms (CRYSTALS-Kyber) are rolling out; legacy RSA/ECC keys still dominate.
- Passkeys (WebAuthn FIDO2) are replacing passwords on Google, Apple, Microsoft platforms.
What still works in 2026
- Long random passphrases (16+ chars, 4+ random words) remain brute-force resistant.
- Hardware security keys (YubiKey, Titan) for 2FA — phishing-proof.
- Password managers with zero-knowledge architecture (Bitwarden, 1Password).
- Per-site unique passwords — credential stuffing still works against reuse.
Mistakes everyone still makes
- Reusing one "strong" password across sites — one breach compromises all.
- Trusting browser autofill on shared devices.
- Using SMS-based 2FA — SIM-swapping attacks are trivial for determined attackers.
- Patching passwords only after breaches instead of proactively rotating.
- Ignoring passkey adoption because "passwords still work".
The 2026 recommendation stack
- 1. Use passkeys wherever supported — no password to phish.
- 2. For password-only sites: 16+ char passphrase from a password manager.
- 3. TOTP 2FA (Aegis/Authy) as fallback; hardware key for high-value accounts.
- 4. Rotate passwords only on confirmed breaches — forced 90-day rotation is outdated NIST guidance.
- 5. Monitor haveibeenpwned.com for credential exposure.
Password manager recommendations (2026)
- Bitwarden — open-source, audited, free tier covers most needs.
- 1Password — travel mode, secret sharing, polished UX.
- KeePassXC — offline, fully self-hosted, no cloud sync by default.
- Apple Passwords / Google Password Manager — convenient but ecosystem-locked.
Quick strength checklist
- ✓ At least 16 characters (or 4+ random words).
- ✓ Unique per site — never reused.
- ✓ Generated/stored by a password manager.
- ✓ 2FA enabled (TOTP or hardware key).
- ✓ Not found in breach databases.
Updated for 2026: includes passkeys, quantum-resistant crypto, and modern password manager guidance.
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