Not yet sourced — YubiKey 5 Series: Power, Capacity, Dimensions, Weight, Warranty, Starting MSRP. Passkeys (FIDO2 Platform Authentication): Power, Capacity, Dimensions, Weight, Warranty, Starting MSRP. No manufacturer, official or retailer source we read publishes these yet; we don't estimate them.
Skip both if
Neither publishes power, capacity, dimensions, weight and 2 more decision fields yet.
✓VerifiedConfidence: 80%
Verdict: For maximum security, YubiKey's hardware-isolated private keys that never touch the internet win — it's the only credential that survives complete platform compromise. For practical security at zero cost, passkeys are a massive improvement over passwords and SMS 2FA for everyday users. The ideal setup is both: passkeys for everyday accounts, YubiKey for high-value accounts (email root, crypto, banking).
How we scored itSpec verificationOwner sentimentLive pricing (4h refresh)Editorial reviewOur methodology →
Provisional pick: Passkeys (FIDO2 Platform Authentication) — not enough sourced decision facts for YubiKey 5 Series and Passkeys (FIDO2 Platform Authentication). We don't rank on specs we can't verify.
YubiKey 5 Series
What works
Private keys are generated and stored in hardware — never exportable, never backed up to cloud, never phishable through software compromise
Works across all platforms (Windows, macOS, Linux, iOS, Android) without platform lock-in — one key works everywhere regardless of device ecosystem
Supports legacy TOTP and OTP protocols in addition to FIDO2 — covers accounts that haven't implemented WebAuthn yet in one device
What doesn't
Physical key can be lost — losing both primary and backup keys locks you out of all registered accounts permanently
Passkeys (fido2 Platform Authentication)
What works
Phishing-resistant by cryptographic design — passkeys cannot be entered on fake sites because authentication is domain-bound, eliminating the most common account compromise vector
Free and built into iOS, Android, Windows, and macOS — no hardware purchase, no setup beyond enabling in account security settings
iCloud Keychain and Google sync make passkeys available across all your own devices automatically — no manual registration on new phone
What doesn't
Cloud-synced passkeys (iCloud/Google) create a new attack surface — compromised Apple ID or Google account exposes all synced passkey private keys
Platform-tied — iCloud Keychain passkeys are Apple ecosystem only; Google passkeys are Android/Chrome — cross-ecosystem use requires a third-party manager like 1Password
Account recovery is more complex than password reset — lost device with no backup recovery method can result in permanent lockout
Bottom line
Provisional pick: Passkeys (FIDO2 Platform Authentication) — not enough sourced decision facts for YubiKey 5 Series and Passkeys (FIDO2 Platform Authentication).
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