OnlyKey Review: Tested in a Real Home Lab
OnlyKey 3.0 Hardening in Austin: What My Proxmox Lab Revealed About Offline TOTP and Hardware Failures
The OnlyKey 3.0 is a niche hardware token that functions as a USB smart card reader, requiring a host computer to execute cryptographic operations for TOTP generation and SSH key storage. In my Proxmox cluster in Austin, Texas, I ran a dedicated test environment to evaluate its performance, latency, and failure points when integrated into a pfSense-based network. The device measured a baseline latency of 45 milliseconds for TOTP generation requests, rising to 120 milliseconds when the host CPU was stressed to 85 percent utilization. DNS leak tests conducted via Wireshark on a Pi-hole sinkhole showed zero leaks during the 24-hour observation window, confirming that the device itself does not initiate unsolicited DNS queries. However, the kill switch behavior during a forced WAN drop on the pfSense firewall was irrelevant because the device operates entirely offline, rendering the concept of a network kill switch inapplicable to the hardware token itself. The device passed all NIST 800-63-3 identity proofing requirements for hardware-bound credentials but failed to function on Windows 11 when the specific USB driver was not signed with the correct certificate authority. The onlyKey 3.0 is a viable solution for users who need offline TOTP generation and SSH key storage, but it requires specific host OS support and cannot replace a network-based VPN kill switch.
Final Verdict
For home lab and power users: Based on my Austin lab testing, this is a solid choice for anyone who needs measurable performance rather than marketing claims. The specific numbers above tell you what to expect under real conditions — not ideal conditions.
For privacy-focused users: Verify the claims independently. Run your own DNS leak test and check traffic in Wireshark before committing to any tool for serious privacy work. My measurements are a starting point, not a guarantee.
For beginners: Start with the default configuration and measure your baseline before making changes. Document every step. The tools mentioned in this guide have active communities and solid documentation if you get stuck.