Yubico security keys are one of the most popular such products that you find on Amazon site. See what they suggest as a safeguard in the case of lost of one key. If you lose one, there s no way anyone can identify your info:\n\nhttps:\/\/support.yubico.com\/hc\/en-us\/articles\/360013647620-Losing-Your-YubiKey\n\n\nSorry, I wasn't specific. I meant in regards to how the individual security bits would get replaced if the USB device was lost, and a replacement device received. I presumed the device would be adequately encrypted\/secure.