Questions tagged [yubikey]
YubiKey is an USB authentication key developed by Yubico.
116
questions
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33 views
Looking for ability to identify U2F device
I know that in terms of security it is not good idea (as explained here: https://github.com/Yubico/libu2f-host/issues/45#issuecomment-337013420). But we can live with that.
Is there any extension of ...
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1answer
100 views
gpg2: How to get rid of “Please insert card with serial number”, getting the same key from a different card / Yubikey
I have multiple Yubikeys carrying the same GPG secret key. I want to switch from one Yubikey to anohter one on my laptop. The two obviously have different serial numbers.
After switching the keys ...
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56 views
Could a Hardware Token Defeat a Keylogger?
I would like to improve my understanding of keyloggers by asking what is feasible with current technology. That is, I mean to be asking a conceptual question that doesn't verge into sci-fi.
My ...
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1answer
46 views
Is there a way to generate a Yubikey OTP without touch?
I'm trying to automate an authentication canary in a workflow that includes a mandatory Yubikey OTP (the 44-character unique password). Is there a way to configure a single Yubikey in such a way that ...
3
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1answer
114 views
Can a provider allowing 2FA with a Yubikey identify me if I use the same key for different accounts?
I was wondering if someone providing a service can identify me (other than by IP, browser fingerprinting etc.) purely based on the code generated by the Yubikey when I touch it, if I use the same ...
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37 views
OpenPGP and 3 Yubikeys, Best Practice for Encryption Subkey
New to OpenPGP. I have 3 Yubikeys, one for my laptop, one for my desktop, and one which I plan to keep in cold storage as a backup. My plan was to create a S/E/A subkey for each Yubikey, attached to ...
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48 views
Is Yubikey HSM2 FIPS Compliant?
I searched for Yubico on this NIST validated modules but found only a module from the Yubico 4 series.
(https://csrc.nist.gov/Projects/Cryptographic-Module-Validation-Program/Validated-Modules/Search)
...
3
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0answers
46 views
What exactly is the Management Key on a yubikey?
The yubico documentation mentions that a Management Key can be set manually, or it can be inferred in the SoC when setting a PIN for the first time.
What exactly is that management key and how does ...
2
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4answers
278 views
Can you set up 2FA with a USB drive?
I want to set up two factor authentication for some of my online accounts. I don't want to install an app, and I don't like using my phone as the physical medium anyway, because it's more likely to ...
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0answers
75 views
Is there any Password Manager that supports Hardware-Based OTP encryption/decryption?
I see that some projects like KeepassXC use CR based OTP to provide some additional security. While this is discussed quite controversial my opinion is that - for quite some cases (e.g. most non-...
2
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0answers
256 views
Can an Android Phone be used as a Windows Hello Security Key?
Microsoft Windows 10 does support physical security keys since some time.
Google recently announced that Android phones can be used as security keys as well (primarily for their own services).
Is ...
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94 views
SSH AUTH : sekey vs yubikey vs ssh-keygen
I've been pondering/hacking/experimenting/using/misusing and am torn/puzzled over this for the past month or so;
Which of these methods should prove themselves more secure/least susceptible to be ...
0
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1answer
111 views
Can 2FA keys be duplicated?
I want to order a 2FA key (like yubikey) online and I want to know if someone could make a duplicate of whatever key I order during shipping.
I don't want to discuss if someone could access my package....
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2answers
142 views
Hardware security key with locked down usb slots
I would like to use hardware security keys in an environment where it is additionally needed to lock down any ways in which a user could download data to a device like a usb key. Is it possible to ...
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0answers
52 views
2FA options for single yubikey and many hosts
I'm considering using yubikey (5 NFC model) as second factor for couple of Linux hosts. I'm interested in sticking it somewhere in PAM stack, so things like sudo are protected. Most of those hosts are ...
1
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1answer
60 views
2fa attestation object for non-repudiation
I am reading on digital signatures:
A valid digital signature gives a recipient reason to believe that the
message was created by a known sender (authentication), that the
sender cannot deny ...
1
vote
1answer
115 views
Creating pointers to keys on SmartCard
I am new to OpenPGP and SmartCards but I cannot find how to do a fairly straight-forward task.
I am trying to sign a file with a private key stored on a YubiKey device.
Here is my session:
$ ...
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46 views
Import/Register GPG keys from a SmartCard/Yubi
I used my desktop to setup my GPG keys, added them to my Yubikey, and then removed them from my desktop so that when I am prompted for the key it asks me to use my Yubikey --instead of asking for a ...
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0answers
110 views
Should I use the same OpenPGP keys in certificates used to provision the YubiKey PIV slots?
I know PIV and OpenPGP are separate standards and independent applications in the YubiKey, but for newcomers like me they look very similar with their signing, encryption and authentication keys, use ...
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0answers
120 views
Import ssh keys into gpg (openpgp) as mutliple authentication subkeys?
I have successfully converted ssh keys to gpg primary keys and then converted them to authentication subkeys using pem2openpgp. Unfortunately there is only one primary key and only one authentication ...
2
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2answers
1k views
Which is more secure Yubikey + Keepass using Challenge/Response or Yubikey + Keepass using OTP?
I use a Windows 10 PC and an Android phone with Keepass.
I would like to add a second factor on top of my master password that works with both Windows 10 and my Android phone.
Between the two ...
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2answers
165 views
GPG: Change expected card number
I have switched from a YubiKey 4 to a YubiKey 5. Both have the same GPG keys stored. After storing the key on the first YubiKey, I fetched my public key so GPG knows where to look for the private key. ...
2
votes
1answer
158 views
gpg ignores passphrase on my key stored on yubikey 5 nfc
I just set-up my yubikey 5 nfc with 3 seperate subkeys (S, E, A).
While encrypting and decrypting works fine (self-tested), I'm questioning the fact that gpg only ever asks me for the yubikey's pgp ...
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2answers
1k views
How do I back up YubiKey-backed TOTP authentication?
I bought a YubiKey 5 NFC this week and have started using 2FA and U2F where I can but am deathly allergic to the idea of losing access.
For backing up U2F access I'm going to buy a second U2F token (...
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1answer
501 views
Why should I leave a U2F device always plugged in to a computer?
Over at the Yubikey website they mention that the Nano or 5C Nano series is meant to be always inserted into a computer. I've seen some other sites mention the Nano is good for servers. But why would ...
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4answers
4k views
Is it reasonable to use KeePassXC with YubiKey?
At the moment, I am using KeePassXC with a relatively strong master password. To further improve security, I thought about buying a YubiKey to have 2-Factor-Authentication.
KeePassXC supports the so ...
2
votes
1answer
73 views
Does password strength matter when using a YubiKey? [duplicate]
I'm considering buying a YubiKey. I already use a password manager which can generate strong passwords, but I wonder if there's even a point with the YubiKey. I guess it just makes one extra step......
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0answers
74 views
Does the output of --export-ssh-key change with different subkeys?
I use gpg --export-ssh-key to generate a public RSA key I can add to my authorized_keys file for the purposes of accessing my server via SSH. I have two Yubikeys (Yubikey 5 NFC) with the same subkeys ...
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0answers
78 views
PGP With 2 x Yuibikey 4 + 1 USB (Backup)
I have 2 Yubikey 4.
I'd like to use them for PGP and overall for securing my online identity.
I'm following this guide but I'm stuck at backup step. The guide itself does not explain how to have keys ...
2
votes
1answer
352 views
Why can GPG sign messages but not keys?
I am trying to add local signatures to a few of the public keys I have in my keyring, but using gpg --lsign-key fails with the message "no secret key" despite the fact that gpg --sign works. I am ...
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0answers
745 views
GnuPG “public key decryption failed: Invalid ID” using Yubikey Smartcard
I'm trying to decrypt a file that was signed with my ssb key stored on my Yubikey, but I get the following errors:
x>gpg -vv --decrypt encrypted.gpg
gpg: armor: BEGIN PGP MESSAGE
# off=0 ctb=XX ...
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1answer
357 views
KeePassXC & Yubikey HMAC-SHA-1 vs 40+ Character Password
Looking at the implementation of the Yubikey 4 HMAC-SHA1 mode for KeePassXC, I want to know:
Isn't the HMAC-SHA1 challenge response less secure than a 40+ character password?
From what I know, the ...
3
votes
0answers
195 views
yubikey creating different ssh public key having same GPG
I have 2 yubikeys and both are having the same GPG master key besides 3 subkeys for encrypting, signing and authentication, I can encrypt/decrypt and everything regarding gpg seems to be working fine, ...
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1answer
129 views
Can an infected endpoint steal private keys from a FIDO U2F Hardware Token / Yubikey?
Is it possible for an infected endpoint to steal private keys from a FIDO U2F Hardware Token / Yubikey? What attacks exist against these hardware tokens? What mitigations are possible? For the scope ...
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2answers
647 views
Why is the U2F secret key on yubikeys is not programmable, and how to get a universal backup token?
I'm trying to figure the best strategy for having a backup U2F token. Ideally, I want to have two identical tokens; obviously I'll have the primary one easily accessible (say, on my keyring), but the ...
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0answers
868 views
Can Yubikey complement a TPM chip?
Does the functionality of an external hardware key overlaps 100% with the one provided by an embedded security chip on a laptop? Or can they complement each other?
Although I assume an external key ...
2
votes
4answers
487 views
Does a two-factor authentication dongle (OTP) which is always inserted in MacBook add a security benefit?
I think to get a Yubikey and read that Keepass with OTP makes no sense No. Security remains the same + extra cognitive overhead.
I try to store all data local and use seldom cloud based services.
If ...
0
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1answer
101 views
Deterministic password generation using Yubikey
I like LastPass but having to have it as a browser plugin means an attacker could steal all my passwords at once. It makes a lot of sense to use a hardware device to store my passwords, like yubikey ...
6
votes
1answer
515 views
Signing/certifying keys as a YubiKey user
After using a yubikey on a day-to-day basis for almost a year, I decided that it was about time to learn how to certify my friends' keys.
I was surprised to learn that one can only sign keys using ...
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1answer
236 views
How to force GPG to use a Keycard when it is available
I have a yubikey (with PGP smartcard function) with my PGP key on it. I did not replace the private key on my main PC with a stub key as keytocard does by default, so I still can use the PGP key with ...
13
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4answers
5k views
Create backup Yubikey with identical PGP keys
I've recently bought two Yubikeys Neo which I'd like to use primarily for encryption and authentification by using the smartcard feature with GnuPG. I've read a few how-to on the subject (most notably ...
5
votes
1answer
292 views
Yubikey Desktop Authenticator
Would you say it is more secure to use Yubikey Desktop Authenticator than Google Authenticator?
Instead of using Google Authenticator every time I want to login to some site I am wondering if it ...
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1answer
150 views
How to use master password for GPG encryption after setting up Yubikey? [closed]
I just setup my Yubikey 4 on Windows. How can I use master password for signing/encrypting when I don't have my key?
If the yubikey is not inserted I get an error "Please insert the card with serial ...
3
votes
1answer
2k views
Does Yubikey 4 support multiple OpenPGP encryption keys or only one?
When my OpenPGP encryption key expires, and I want to generate a new one, can I keep the old one on my Yubikey 4, or will I have to reencrypt all of my encrypted files/emails with the new key? If I ...
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0answers
307 views
Weighing options for personal HSM?
I'm trying to weigh my options for a personal HSM. I wish to store both passwords and private PGP keys. I've been doing my research but I'm not a security expert and am feeling slightly overwhelmed; ...
3
votes
1answer
2k views
Windows GnuPG - GPG - Smart Card Status - Not Detecting Yubikey
I have a Yubikey 4. On a Windows 7 64 bit machine I installed Gpg4Win which includes GnugPG. I was able to successfully import public keys. I plugged in the Yubikey 4 and Windows correctly ...
2
votes
1answer
3k views
GPG with Yubikey smart card - smart card doesn't need to be plugged in! [duplicate]
I have created an offline MASTER key along with sub keys. The sub keys were sent to the Yubikey smartcard via the gpg 'keytocard'. The gpg --card-status command correctly identifies the information ...
3
votes
2answers
552 views
Encryption using multiple Yubikeys, any of which can unlock
I was hoping to use my Yubikey for file encryption, but also wanted to have a backup Yubikey work to unlock the file.
From a conceptual point of view, I know it is possible since, even as is, I ...
3
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0answers
844 views
How do security properties of Trezor's FIDO U2F differ from Yubikey?
Aside from being a bitcoin wallet, the Trezor supports FIDO U2F and seems to offer some unique benefits over a Yubikey:
The keys are always generated on the device and never rely on the manufacturer ...
4
votes
2answers
322 views
Security benefit of hardware backed host keys for OpenSSH
There was recently a "two for the price of one" deal on the Yubikey 4 and now I have too many of them.
This got me thinking about things to do with them, more or less useful. Of course I already use ...
