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Add note about KDF

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Jaeha Choi 2021-09-06 20:29:32 -07:00
parent 31074ac13d
commit b59107d413
No known key found for this signature in database
GPG Key ID: FC8A150CF6C09314
1 changed files with 14 additions and 3 deletions
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README.md
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@ -36,6 +36,7 @@ If you have a comment or suggestion, please open an [Issue](https://github.com/d
- [Export public keys](#export-public-keys)
- [Configure Smartcard](#configure-smartcard)
* [Change PIN](#change-pin)
* [Enable KDF](#enable-kdf)
* [Set information](#set-information)
- [Transfer keys](#transfer-keys)
* [Signing](#signing-1)
@ -1274,6 +1275,7 @@ Key attributes ...: rsa2048 rsa2048 rsa2048
Max. PIN lengths .: 127 127 127
PIN retry counter : 3 0 3
Signature counter : 0
KDF setting ......: off
Signature key ....: [none]
Encryption key....: [none]
Authentication key: [none]
@ -1286,6 +1288,16 @@ General key info..: [none]
Use the [YubiKey Manager](https://developers.yubico.com/yubikey-manager) application (note, this not the similarly named older YubiKey NEO Manager) to enable CCID functionality.
## Enable KDF
Key Derived Function (KDF) enables YubiKey to store the hash of PIN, preventing the PIN from being passed as plain text.
```console
gpg/card> admin
Admin commands are allowed
gpg/card> kdf-setup
```
## Change PIN
The [GPG interface](https://developers.yubico.com/PGP/) is separate from other modules on a Yubikey such as the [PIV interface](https://developers.yubico.com/PIV/Introduction/YubiKey_and_PIV.html). The GPG interface has its own *PIN*, *Admin PIN*, and *Reset Code* - these should be changed from default values!
@ -1305,9 +1317,6 @@ Values are valid up to 127 ASCII characters and must be at least 6 (*PIN*) or 8
To update the GPG PINs on the Yubikey:
```console
gpg/card> admin
Admin commands are allowed
gpg/card> passwd
gpg: OpenPGP card no. D2760001240102010006055532110000 detected
@ -1376,6 +1385,7 @@ Key attributes ...: rsa2048 rsa2048 rsa2048
Max. PIN lengths .: 127 127 127
PIN retry counter : 3 0 3
Signature counter : 0
KDF setting ......: on
Signature key ....: [none]
Encryption key....: [none]
Authentication key: [none]
@ -1681,6 +1691,7 @@ Key attributes ...: rsa4096 rsa4096 rsa4096
Max. PIN lengths .: 127 127 127
PIN retry counter : 3 3 3
Signature counter : 0
KDF setting ......: on
Signature key ....: 07AA 7735 E502 C5EB E09E B8B0 BECF A3C1 AE19 1D15
created ....: 2016-05-24 23:22:01
Encryption key....: 6F26 6F46 845B BEB8 BDF3 7E9B 5912 A795 E90D D2CF