Security & PrivacyPasskeys, YubiKeys, and Hardware Auth: Security Guide
Practical guide to passkeys, YubiKeys, WebAuthn, recovery codes, synced vs device-bound credentials…
Comparison · DeviceJul 7, 2026 · upd Sep 18, 2026OpenSecurity and privacy cheat sheets
Five pages, each built to be executed rather than read. The Linux hardening checklist is copy-paste commands in the order you run them on a fresh Ubuntu or Debian box. The passkeys page settles the synced-versus-device-bound question and what to do about recovery. The personal cybersecurity checklist is a threat model first and a tool list second, because most people buy tools for threats they do not have.
The data broker opt-out guide is the tedious one: a step-by-step US procedure for getting your records out of the people-search sites, with the forms and the timelines. Post-quantum cryptography covers the NIST standards and what a migration actually involves; it pairs with the custody-specific version in the crypto custody section.
5 references filed under Security & Privacy. Most read right now: Data Broker Opt-Out List: Nuwber, Spokeo, Whitepages & More; Passkeys, YubiKeys, and Hardware Auth: Security Guide; Personal Cybersecurity: A Practical Threat-Model Checklist.
Start here
- Linux Server Hardening: Checklist & Paste-Ready CommandsRun it top to bottom on a new server
- Personal Cybersecurity: A Practical Threat-Model ChecklistThreat model first, then the short list of tools
- Passkeys, YubiKeys, and Hardware Auth: Security GuidePasskeys, WebAuthn and recovery without lockout
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Every sheet here is produced by a governed Claude Code pipeline: a version-controlled spec as acceptance criteria, primary-source research, a self-verification gate, and a public git audit trail. Read how it is built or browse the source on GitHub.
Security & Privacy
Security & PrivacyPersonal Cybersecurity: A Practical Threat-Model Checklist
A personal cybersecurity checklist: password manager, phishing-resistant MFA and passkeys, email/phone…
Comparison · ProcedureJun 28, 2026 · upd Sep 18, 2026Open
Security & PrivacyLinux Server Hardening: Checklist & Paste-Ready Commands
An interactive Linux/Ubuntu/Debian hardening checklist with copy-paste commands: SSH keys, ufw…
Comparison · ProcedureJun 16, 2026 · upd Sep 18, 2026Open
Security & PrivacyData Broker Opt-Out List: Nuwber, Spokeo, Whitepages & More
Data broker opt-out list for US residents: step-by-step removal from Nuwber, BeenVerified, Spokeo…
Comparison · ProcedureMar 18, 2026 · upd Oct 25, 2026Open
Security & PrivacyComprehensive Guide to Post-Quantum Cryptography
A comprehensive, interactive guide to post-quantum cryptography: NIST-standardized algorithms…
EssayMay 21, 2025 · upd Oct 25, 2026OpenNothing matches those filters. Clear them and start again.
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