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YubiKey-Guide
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Merge pull request #91 from kalbasit/yubikey_improve-security 

Master key should have Certify-capability only!
This commit is contained in:
drduh 2019-02-03 03:56:08 +00:00 committed by GitHub
parent 035d98ebbe 7115f9a385
commit ae3e9703f9
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 63 additions and 27 deletions
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@ -206,17 +206,53 @@ $ gpg --gen-random -a 0 24
ydOmByxmDe63u7gqx2XI9eDgpvJwibNH ydOmByxmDe63u7gqx2XI9eDgpvJwibNH
``` ```
Generate a new key with GPG, selecting `(4) RSA (sign only)` and `4096` bit keysize. Do not set the key to expire - see [Note #3](#notes). Generate a new key with GPG, selecting `(8) RSA (set your own capabilities)`, `Certify`-only and `4096` bit keysize. Do not set the key to expire - see [Note #3](#notes).
```console ```console
$ gpg --full-generate-key $ gpg --expert --full-generate-key
Please select what kind of key you want: Please select what kind of key you want:
(1) RSA and RSA (default) (1) RSA and RSA (default)
(2) DSA and Elgamal (2) DSA and Elgamal
(3) DSA (sign only) (3) DSA (sign only)
(4) RSA (sign only) (4) RSA (sign only)
Your selection? 4 (7) DSA (set your own capabilities)
(8) RSA (set your own capabilities)
(9) ECC and ECC
(10) ECC (sign only)
(11) ECC (set your own capabilities)
(13) Existing key
Your selection? 8
Possible actions for a RSA key: Sign Certify Encrypt Authenticate
Current allowed actions: Sign Certify Encrypt
(S) Toggle the sign capability
(E) Toggle the encrypt capability
(A) Toggle the authenticate capability
(Q) Finished
Your selection? e
Possible actions for a RSA key: Sign Certify Encrypt Authenticate
Current allowed actions: Sign Certify
(S) Toggle the sign capability
(E) Toggle the encrypt capability
(A) Toggle the authenticate capability
(Q) Finished
Your selection? s
Possible actions for a RSA key: Sign Certify Encrypt Authenticate
Current allowed actions: Certify
(S) Toggle the sign capability
(E) Toggle the encrypt capability
(A) Toggle the authenticate capability
(Q) Finished
Your selection? q
RSA keys may be between 1024 and 4096 bits long. RSA keys may be between 1024 and 4096 bits long.
What keysize do you want? (2048) 4096 What keysize do you want? (2048) 4096
Requested keysize is 4096 bits Requested keysize is 4096 bits
@ -252,7 +288,7 @@ public and secret key created and signed.
Note that this key cannot be used for encryption. You may want to use Note that this key cannot be used for encryption. You may want to use
the command "--edit-key" to generate a subkey for this purpose. the command "--edit-key" to generate a subkey for this purpose.
pub rsa4096/0xFF3E7D88647EBCDB 2017-10-09 [SC] pub rsa4096/0xFF3E7D88647EBCDB 2017-10-09 [C]
Key fingerprint = 011C E16B D45B 27A5 5BA8 776D FF3E 7D88 647E BCDB Key fingerprint = 011C E16B D45B 27A5 5BA8 776D FF3E 7D88 647E BCDB
uid Dr Duh <doc@duh.to> uid Dr Duh <doc@duh.to>
``` ```
@ -275,7 +311,7 @@ $ gpg --expert --edit-key $KEYID
Secret key is available. Secret key is available.
sec rsa4096/0xEA5DE91459B80592 sec rsa4096/0xEA5DE91459B80592
created: 2017-10-09 expires: never usage: SC created: 2017-10-09 expires: never usage: C
trust: ultimate validity: ultimate trust: ultimate validity: ultimate
[ultimate] (1). Dr Duh <doc@duh.to> [ultimate] (1). Dr Duh <doc@duh.to>
``` ```
@ -323,7 +359,7 @@ disks) during the prime generation; this gives the random number
generator a better chance to gain enough entropy. generator a better chance to gain enough entropy.
sec rsa4096/0xFF3E7D88647EBCDB sec rsa4096/0xFF3E7D88647EBCDB
created: 2017-10-09 expires: never usage: SC created: 2017-10-09 expires: never usage: C
trust: ultimate validity: ultimate trust: ultimate validity: ultimate
ssb rsa4096/0xBECFA3C1AE191D15 ssb rsa4096/0xBECFA3C1AE191D15
created: 2017-10-09 expires: 2018-10-09 usage: S created: 2017-10-09 expires: 2018-10-09 usage: S
@ -367,7 +403,7 @@ disks) during the prime generation; this gives the random number
generator a better chance to gain enough entropy. generator a better chance to gain enough entropy.
sec rsa4096/0xFF3E7D88647EBCDB sec rsa4096/0xFF3E7D88647EBCDB
created: 2017-10-09 expires: never usage: SC created: 2017-10-09 expires: never usage: C
trust: ultimate validity: ultimate trust: ultimate validity: ultimate
ssb rsa4096/0xBECFA3C1AE191D15 ssb rsa4096/0xBECFA3C1AE191D15
created: 2017-10-09 expires: 2018-10-09 usage: S created: 2017-10-09 expires: 2018-10-09 usage: S
@ -455,7 +491,7 @@ disks) during the prime generation; this gives the random number
generator a better chance to gain enough entropy. generator a better chance to gain enough entropy.
sec rsa4096/0xFF3E7D88647EBCDB sec rsa4096/0xFF3E7D88647EBCDB
created: 2017-10-09 expires: never usage: SC created: 2017-10-09 expires: never usage: C
trust: ultimate validity: ultimate trust: ultimate validity: ultimate
ssb rsa4096/0xBECFA3C1AE191D15 ssb rsa4096/0xBECFA3C1AE191D15
created: 2017-10-09 expires: 2018-10-09 usage: S created: 2017-10-09 expires: 2018-10-09 usage: S
@ -476,7 +512,7 @@ List the generated secret keys and verify the output:
$ gpg --list-secret-keys $ gpg --list-secret-keys
/tmp.FLZC0xcM/pubring.kbx /tmp.FLZC0xcM/pubring.kbx
------------------------------------------------------------------------- -------------------------------------------------------------------------
sec rsa4096/0xFF3E7D88647EBCDB 2017-10-09 [SC] sec rsa4096/0xFF3E7D88647EBCDB 2017-10-09 [C]
Key fingerprint = 011C E16B D45B 27A5 5BA8 776D FF3E 7D88 647E BCDB Key fingerprint = 011C E16B D45B 27A5 5BA8 776D FF3E 7D88 647E BCDB
uid Dr Duh <doc@duh.to> uid Dr Duh <doc@duh.to>
ssb rsa4096/0xBECFA3C1AE191D15 2017-10-09 [S] [expires: 2018-10-09] ssb rsa4096/0xBECFA3C1AE191D15 2017-10-09 [S] [expires: 2018-10-09]
@ -782,7 +818,7 @@ $ gpg --edit-key $KEYID
Secret key is available. Secret key is available.
sec rsa4096/0xFF3E7D88647EBCDB sec rsa4096/0xFF3E7D88647EBCDB
created: 2017-10-09 expires: never usage: SC created: 2017-10-09 expires: never usage: C
trust: ultimate validity: ultimate trust: ultimate validity: ultimate
ssb rsa4096/0xBECFA3C1AE191D15 ssb rsa4096/0xBECFA3C1AE191D15
created: 2017-10-09 expires: 2018-10-09 usage: S created: 2017-10-09 expires: 2018-10-09 usage: S
@ -801,7 +837,7 @@ Select and move the signature key. You will be prompted for the key passphrase a
gpg> key 1 gpg> key 1
sec rsa4096/0xFF3E7D88647EBCDB sec rsa4096/0xFF3E7D88647EBCDB
created: 2017-10-09 expires: never usage: SC created: 2017-10-09 expires: never usage: C
trust: ultimate validity: ultimate trust: ultimate validity: ultimate
ssb* rsa4096/0xBECFA3C1AE191D15 ssb* rsa4096/0xBECFA3C1AE191D15
created: 2017-10-09 expires: 2018-10-09 usage: S created: 2017-10-09 expires: 2018-10-09 usage: S
@ -832,7 +868,7 @@ gpg> key 1
gpg> key 2 gpg> key 2
sec rsa4096/0xFF3E7D88647EBCDB sec rsa4096/0xFF3E7D88647EBCDB
created: 2017-10-09 expires: never usage: SC created: 2017-10-09 expires: never usage: C
trust: ultimate validity: ultimate trust: ultimate validity: ultimate
ssb rsa4096/0xBECFA3C1AE191D15 ssb rsa4096/0xBECFA3C1AE191D15
created: 2017-10-09 expires: 2018-10-09 usage: S created: 2017-10-09 expires: 2018-10-09 usage: S
@ -860,7 +896,7 @@ gpg> key 2
gpg> key 3 gpg> key 3
sec rsa4096/0xFF3E7D88647EBCDB sec rsa4096/0xFF3E7D88647EBCDB
created: 2017-10-09 expires: never usage: SC created: 2017-10-09 expires: never usage: C
trust: ultimate validity: ultimate trust: ultimate validity: ultimate
ssb rsa4096/0xBECFA3C1AE191D15 ssb rsa4096/0xBECFA3C1AE191D15
created: 2017-10-09 expires: 2018-10-09 usage: S created: 2017-10-09 expires: 2018-10-09 usage: S
@ -886,7 +922,7 @@ Verify the subkeys have moved to YubiKey as indicated by `ssb>`:
$ gpg --list-secret-keys $ gpg --list-secret-keys
/tmp.FLZC0xcM/pubring.kbx /tmp.FLZC0xcM/pubring.kbx
------------------------------------------------------------------------- -------------------------------------------------------------------------
sec rsa4096/0xFF3E7D88647EBCDB 2017-10-09 [SC] sec rsa4096/0xFF3E7D88647EBCDB 2017-10-09 [C]
Key fingerprint = 011C E16B D45B 27A5 5BA8 776D FF3E 7D88 647E BCDB Key fingerprint = 011C E16B D45B 27A5 5BA8 776D FF3E 7D88 647E BCDB
uid Dr Duh <doc@duh.to> uid Dr Duh <doc@duh.to>
ssb> rsa4096/0xBECFA3C1AE191D15 2017-10-09 [S] [expires: 2018-10-09] ssb> rsa4096/0xBECFA3C1AE191D15 2017-10-09 [S] [expires: 2018-10-09]
@ -1008,7 +1044,7 @@ $ gpg --edit-key $KEYID
Secret key is available. Secret key is available.
gpg> trust gpg> trust
pub 4096R/0xFF3E7D88647EBCDB created: 2016-05-24 expires: never usage: SC pub 4096R/0xFF3E7D88647EBCDB created: 2016-05-24 expires: never usage: C
trust: unknown validity: unknown trust: unknown validity: unknown
sub 4096R/0xBECFA3C1AE191D15 created: 2017-10-09 expires: 2018-10-09 usage: S sub 4096R/0xBECFA3C1AE191D15 created: 2017-10-09 expires: 2018-10-09 usage: S
sub 4096R/0x5912A795E90DD2CF created: 2017-10-09 expires: 2018-10-09 usage: E sub 4096R/0x5912A795E90DD2CF created: 2017-10-09 expires: 2018-10-09 usage: E
@ -1028,7 +1064,7 @@ Please decide how far you trust this user to correctly verify other users' keys
Your decision? 5 Your decision? 5
Do you really want to set this key to ultimate trust? (y/N) y Do you really want to set this key to ultimate trust? (y/N) y
pub 4096R/0xFF3E7D88647EBCDB created: 2016-05-24 expires: never usage: SC pub 4096R/0xFF3E7D88647EBCDB created: 2016-05-24 expires: never usage: C
trust: ultimate validity: unknown trust: ultimate validity: unknown
sub 4096R/0xBECFA3C1AE191D15 created: 2017-10-09 expires: 2018-10-09 usage: S sub 4096R/0xBECFA3C1AE191D15 created: 2017-10-09 expires: 2018-10-09 usage: S
sub 4096R/0x5912A795E90DD2CF created: 2017-10-09 expires: 2018-10-09 usage: E sub 4096R/0x5912A795E90DD2CF created: 2017-10-09 expires: 2018-10-09 usage: E