Keaslian paket di lumbung turunan Debian dibantu oleh verifikasi tanda tangan digital dengan kunci GPG (itu sebabnya alamat lumbung tersebut tidak perlu lagi dilindungi oleh HTTPS/TLS, lihat https://whydoesaptnotusehttps.com/). Kita memerlukan kunci GPG untuk menandatangani paket-paket nantinya. Setelah dibuat sesuai panduan di bawah ini, kunci-kunci ini akan tersimpan di /.gnugpg.
$ sudo apt-get install rng-tools
$ sudo rngd -r /dev/urandom
Abaikan permintaan passphrase untuk menunjang otomasi penandatanganan paket.
gpg --full-generate-key
gpg (GnuPG) 2.1.18; Copyright (C) 2017 Free Software Foundation, Inc.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Please select what kind of key you want:
(1) RSA and RSA (default)
(2) DSA and Elgamal
(3) DSA (sign only)
(4) RSA (sign only)
Your selection? 1
RSA keys may be between 1024 and 4096 bits long.
What keysize do you want? (2048) 4096
Requested keysize is 4096 bits
Please specify how long the key should be valid.
0 = key does not expire
<n> = key expires in n days
<n>w = key expires in n weeks
<n>m = key expires in n months
<n>y = key expires in n years
Key is valid for? (0) 5y
Key expires at Wed Jan 24 04:58:41 2024 EST
Is this correct? (y/N) y
GnuPG needs to construct a user ID to identify your key.
Real name: BlankOn Developer
Email address: blankon-dev@googlegroups.com
Comment:
You selected this USER-ID:
"BlankOn Developer <blankon-dev@googlegroups.com>"
Change (N)ame, (C)omment, (E)mail or (O)kay/(Q)uit? O
We need to generate a lot of random bytes. It is a good idea to perform
some other action (type on the keyboard, move the mouse, utilize the
disks) during the prime generation; this gives the random number
generator a better chance to gain enough entropy.
gpg: key 17963DC67219B965 marked as ultimately trusted
gpg: revocation certificate stored as '/home/arsipdev-reboot/.gnupg/openpgp-revocs.d/9584C1230204D624A15D215117963DC67219B965.rev'
public and secret key created and signed.
pub rsa4096 2019-01-25 [SC] [expires: 2024-01-24]
9584C1230204D624A15D215117963DC67219B965
9584C1230204D624A15D215117963DC67219B965
uid BlankOn Developer <blankon-dev@googlegroups.com>
sub rsa4096 2019-01-25 [E] [expires: 2024-01-24]
Parameternya adalah identitas kunci master.
gpg --edit-key 05657D94F29BDACB99F6CE7D0B352C08D746A9A6
gpg (GnuPG) 2.1.18; Copyright (C) 2017 Free Software Foundation, Inc.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Secret key is available.
gpg: checking the trustdb
gpg: marginals needed: 3 completes needed: 1 trust model: pgp
gpg: depth: 0 valid: 2 signed: 0 trust: 0-, 0q, 0n, 0m, 0f, 2u
gpg: next trustdb check due at 2021-01-24
sec rsa2048/0B352C08D746A9A6
created: 2019-01-25 expires: 2021-01-24 usage: SC
trust: ultimate validity: ultimate
ssb rsa2048/BE8FF591E6569748
created: 2019-01-25 expires: 2021-01-24 usage: E
[ultimate] (1). BlankOn Developer <blankon-dev@googlegroups.com>
gpg> addkey
Please select what kind of key you want:
(3) DSA (sign only)
(4) RSA (sign only)
(5) Elgamal (encrypt only)
(6) RSA (encrypt only)
Your selection? 4
RSA keys may be between 1024 and 4096 bits long.
What keysize do you want? (2048) 4096
Requested keysize is 4096 bits
Please specify how long the key should be valid.
0 = key does not expire
<n> = key expires in n days
<n>w = key expires in n weeks
<n>m = key expires in n months
<n>y = key expires in n years
Key is valid for? (0) 5y
Key expires at Wed Jan 24 05:06:05 2024 EST
Is this correct? (y/N) y
Really create? (y/N) y
We need to generate a lot of random bytes. It is a good idea to perform
some other action (type on the keyboard, move the mouse, utilize the
disks) during the prime generation; this gives the random number
generator a better chance to gain enough entropy.
sec rsa2048/0B352C08D746A9A6
created: 2019-01-25 expires: 2021-01-24 usage: SC
trust: ultimate validity: ultimate
ssb rsa2048/BE8FF591E6569748
created: 2019-01-25 expires: 2021-01-24 usage: E
ssb rsa4096/1C608FE2ECC8842B
created: 2019-01-25 expires: 2024-01-24 usage: S
[ultimate] (1). BlankOn Developer <blankon-dev@googlegroups.com>
gpg> save
Identitas kunci anak ini (string 0B352C08D746A9A6) yang akan dipakai di konfigurasi lumbung nantinya.
Tujuan penggunaan subkey dan pemisahan kunci master adalah supaya bila kunci tanda tangan terkena kompromi, kunci penanda tangan baru masih bisa diterbitkan dan paket lama masih bisa diverifikasi.
$ gpg --export-secret-key 05657D94F29BDACB99F6CE7D0B352C08D746A9A6 > private.key
$ gpg --export 05657D94F29BDACB99F6CE7D0B352C08D746A9A6 >> private.key
Simpan berkas private.key ini ke tempat yang aman.
Pisahkan kunci publik master dan kunci privat anak.
$ gpg --export 05657D94F29BDACB99F6CE7D0B352C08D746A9A6 > public.key
$ gpg --export-secret-subkeys 0B352C08D746A9A6 > signing.key
Hapus kunci privat master dari gnupg.
$ gpg --delete-secret-key 05657D94F29BDACB99F6CE7D0B352C08D746A9A6
Impor kembali kunci publik master dan kunci privat anak.
$ gpg --import public.key signing.key
Pastikan kunci privat master sudah tidak terdaftar di gnupg.
$ gpg --list-secret-keys
/home/arsipdev/.gnupg/pubring.kbx
----------------------------------------
sec# rsa4096 2019-01-25 [SC] [expires: 2024-01-24]
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
uid [ultimate] BlankOn Developer <blankon-dev@googlegroups.com>
ssb rsa4096 2019-01-25 [E] [expires: 2024-01-24]
ssb rsa4096 2019-01-25 [S] [expires: 2024-01-24]
Simbol # setelah sec menandakan tidak ada kunci privat master di gnupg.