4 ms·

I like the form factor, but as a second factor it sucks. Effectively your computer becomes the second factor, and it's much more likely that your laptop (with t

by bonzini 10y ago

I like the form factor, but as a second factor it sucks. Effectively your computer becomes the second factor, and it's much more likely that your laptop (with the Nano plugged in it) is stolen, than a keychain with a bigger Neo. It's acceptable if you only use it for OTP, but I can't get myself to put GPG private keys on a Yubikey Nano...

niftich 10y ago
The Nano is essentially a Client Certificate in USB form.
tjohns 10y ago
You could just put a GPG subkey on it. That way it's revokable if lost, without destroying your entire PGP key.
bascule 10y ago
Why? Your GPG key is airgapped and inextricable (except possibly via something like a DPA-style attack), and you can set a PIN required to perform any private key operations, complete with a configurable number of attempts before the device wipes itself. There are DPA attacks to be worried about, but if you set a decent PIN and limit the number of failed attempts your GPG keys will probably be safe if your Yubikey is ever lost/stolen.
- lmm 10y ago
  I figure I can get a lot more security with a practical-length passphrase than a practical-length PIN.
  - Xylakant 10y ago
    I have a 6 digit pin (8 digit admin pin) with 3 retries before the device wipes itself. The chances of an attacker cracking that are negligible - I'm more concerned about someone observing my typing (applies to passphrase as well) or actual physical attacks on the yubikey (stolen, decapped, ...) but I'm not the target demographic where such effort would be warranted (or at least I hope so). An attacker could backdoor my PC and intercept the passphrase dialog - but in that case he'd still need my yubikey which makes remote attacks impractical and makes me notice the theft. This is not the case with a passphrase on a secret key - a machine compromise may silently take everything without you ever noticing.
- tossedaway334 10y ago
  That is not what airgapped means.

by bonzini 10y ago

niftich 10y ago

The Nano is essentially a Client Certificate in USB form.

tjohns 10y ago

You could just put a GPG subkey on it. That way it's revokable if lost, without destroying your entire PGP key.

bascule 10y ago

Why? Your GPG key is airgapped and inextricable (except possibly via something like a DPA-style attack), and you can set a PIN required to perform any private key operations, complete with a configurable number of attempts before the device wipes itself. There are DPA attacks to be worried about, but if you set a decent PIN and limit the number of failed attempts your GPG keys will probably be safe if your Yubikey is ever lost/stolen.

lmm 10y ago
I figure I can get a lot more security with a practical-length passphrase than a practical-length PIN.
- Xylakant 10y ago
  I have a 6 digit pin (8 digit admin pin) with 3 retries before the device wipes itself. The chances of an attacker cracking that are negligible - I'm more concerned about someone observing my typing (applies to passphrase as well) or actual physical attacks on the yubikey (stolen, decapped, ...) but I'm not the target demographic where such effort would be warranted (or at least I hope so). An attacker could backdoor my PC and intercept the passphrase dialog - but in that case he'd still need my yubikey which makes remote attacks impractical and makes me notice the theft. This is not the case with a passphrase on a secret key - a machine compromise may silently take everything without you ever noticing.
tossedaway334 10y ago
That is not what airgapped means.