Questions tagged [yubikey]
YubiKey is an USB authentication key developed by Yubico.
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26 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
68 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
46 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 ...
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2answers
205 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 ...
2
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2answers
79 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
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1answer
77 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 ...
1
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2answers
290 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
134 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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3answers
1k 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
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1answer
64 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
40 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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70 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 ...
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1answer
137 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
503 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
216 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 ...
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0answers
27 views
Authentication implications for a mapped PIV certificate
I've been researching smart card auth and the pass the hash vulnerabilities that go along with it. There is a case I'm interested in but can't find documentation on.
Some of the devices I've looked ...
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0answers
150 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
106 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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1answer
390 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
363 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 ...
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4answers
374 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 ...
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1answer
81 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 ...
4
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1answer
368 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
162 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 ...
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4answers
3k 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
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1answer
262 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 ...
0
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1answer
122 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
1k 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
248 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; ...
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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
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1answer
2k 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
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2answers
486 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 ...
2
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0answers
750 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
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2answers
303 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 ...
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0answers
84 views
Are all the FIDO U2F tools from Yubico cross-compatible
So I recently got myself one U2F security key to experiment with all the services that support it. However I didn't go for the mainstream option (Yubikey) since most models are quite expensive for my ...
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1answer
779 views
Can I generate and store keys on my Yubico?
Its a simple question but there's no answer in the Yubico's website
When I recive a Yubico (from the Yubico 4 series), I know I can sign code, for example. But how is the key inside it generated? Is ...
4
votes
1answer
131 views
Finding out the password or bypass Linux password for home encryption?
I forgot the password of one of my account on Ubuntu 16.04.
The user account directory is encrypted.
I have configured the Yubikey SSH key based login so I am able to login, into that account. But ...
3
votes
2answers
2k views
How to use YubiKey through GnuPG on remote server?
I'm wondering if it is possible to use a Yubikey to unlock for example a GnuPG key on a server, so can I somehow pass the generated token from the YubiKey over SSH to the server in an easy way?
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2answers
304 views
Would it be possible to store Kerberos tickets on a YubiKey?
Kerberos supports different ways (ccache types) of storing tickets, such as:
FILE
MEMORY
KEYRING
I was wondering whether it would technically be possible to also store the Ticket-granting-ticket and ...
2
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0answers
248 views
Setting up Yubikey for GnuPG on Linux Mint: Unsupported certificate
I am trying to set up my Yubikey 4 for GnuPGP following the Yubico documentation. I plugged in my Yubikey and it is recognized:
$ lsusb
...
Bus 001 Device 005: ID 1050:0407 Yubico.com
...
However, ...
4
votes
2answers
439 views
Why aren't hardware SSH keys the default access for production systems?
In the Bitcoin world I see people using hardware key stores (and hardware signing devices) as the de-facto only secure way of storing and transmitting $M values.
Wouldn't a hardware SSH keystore be ...
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1answer
2k views
GPG encryption subkey on multiple smart cards issue
Is there a way to tell GPG, that if it needs to decrypt something, that it can find the private encryption key on one of two smart cards?
My (simplified) setup is as follows:
Generated a master key ...
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2answers
216 views
How does concatenating a user password and a YubiKey OTP work?
I use a Yubikey to log in to a VPN. When logging in, I supply a username, and then type a password, and without hitting return, touch the Yubikey.
As far as I understand, and from experimenting, the ...
3
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1answer
468 views
In the context of FIDO U2F, when is a new ephemeral key reused, or cached?
I'm reading this paper from Yubico on Universal Second Factor
and OpenID Connect and see the description about ephemeral keys
I'm confused on when a ephemeral key is used, and under what conditions ...
4
votes
1answer
1k views
How secure is Google’s/Android’s Smart Lock functionality?
Newer Android phones (since Android 5, “Lollipop”) have the Smart Lock functionality that allows one to unlock the phone, among other ways, with a trusted device (Bluetooth or NFC) instead of entering ...
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3answers
820 views
Is it safe to publish public PGP authentication subkeys?
Suppose I have a PGP key set up as follows:
I have an offline master public/private keypair, which is set to only Certify, aka create subkeys and sign other people's keys.
Then I create three ...
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1answer
1k views
Security of KeePass and Yubikey OATH-HOTP
How secure is KeePass in addition with a Yubikey with OATH-HOTP?
I read in Yubikey with KeePass using challenge-response vs OATH-HOTP that with OATH-HOTP there isn´t added a real second factor.
But ...
9
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1answer
382 views
Pin required for accessing (smartcard) Card Authentication Slot
So let me set the stage:
I have created an Intermediate Signing Certificate by way of the Yubico walkthrough: https://developers.yubico.com/PIV/Guides/Certificate_authority.html
I made a couple ...
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1answer
263 views
Yubikey for signing efi images, could not find token
I am trying to sign an efi image with a Yubikey 4
I configured Yubikey with the following:
yubico-piv-tool -k $key -a import-key -s 9c < test-key.rsa
yubico-piv-tool -k $key -a import-certificate ...
1
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1answer
903 views
Why do I get a warning when specifying the recipient for signing a document?
I just got a Yubikey 4 and I generate the key with gpg2 --card-edit and now I have this:
$ gpg2 --list-key
/home/lilas/.gnupg/pubring.kbx
------------------------------
pub rsa2048/EA3829E3 2016-11-...
