>我创建了一个密钥,并创建了一个子密钥。使用子项,我签署了一个文件。验证有效。已吊销密钥,验证不成立。这是预期行为。
但是,如果我尝试使用相同的子项签名并验证它仍然有效。我做错了什么?以下是我正在做的全部工作:
$ gpg --gen-key
$ gpg -k
/Users/mustafa/.gnupg/pubring.kbx
---------------------------------
pub rsa2048 2019-02-03 [SC] [expires: 2021-02-02]
5DD923FBCF6392A5CB366167D4C0627A07510C6C
uid [ultimate] Mustafa <mustafa91@gmail.com>
sub rsa2048 2019-02-03 [E] [expires: 2021-02-02]
使用编辑键,添加一个子项。
$ gpg --edit-key 5DD923FBCF6392A5CB366167D4C0627A07510C6C
sec rsa2048/D4C0627A07510C6C
created: 2019-02-03 expires: 2021-02-02 usage: SC
trust: ultimate validity: ultimate
ssb rsa2048/E058B91696C43666
created: 2019-02-03 expires: 2021-02-02 usage: E
gpg> addkey
sec rsa2048/D4C0627A07510C6C
created: 2019-02-03 expires: 2021-02-02 usage: SC
trust: ultimate validity: ultimate
ssb rsa2048/E058B91696C43666
created: 2019-02-03 expires: 2021-02-02 usage: E
ssb rsa2048/38616BDAE66E418C
created: 2019-02-03 expires: 2019-02-13 usage: S
[ultimate] (1). Mustafa <mustafa91@gmail.com>
gpg> q
Save changes? (y/N) y
对文件进行签名并验证。
$ gpg --armor --detach-sign --default-key 38616BDAE66E418C test.txt
gpg: using "38616BDAE66E418C" as default secret key for signing
$ gpg --verify test.txt.asc test.txt
gpg: Signature made Sun Feb 3 21:49:43 2019 +03
gpg: using RSA key 485FC77FC73DA3B800C7F41538616BDAE66E418C
gpg: Good signature from "Mustafa <mustafa91@gmail.com>" [ultimate]
撤销密钥,并显示消息"此密钥现在在敌人手中"。
$ gpg --edit-key 5DD923FBCF6392A5CB366167D4C0627A07510C6C
gpg> key 2
sec rsa2048/D4C0627A07510C6C
created: 2019-02-03 expires: 2021-02-02 usage: SC
trust: ultimate validity: ultimate
ssb rsa2048/E058B91696C43666
created: 2019-02-03 expires: 2021-02-02 usage: E
ssb* rsa2048/38616BDAE66E418C
created: 2019-02-03 expires: 2019-02-13 usage: S
gpg> revkey
sec rsa2048/D4C0627A07510C6C
created: 2019-02-03 expires: 2021-02-02 usage: SC
trust: ultimate validity: ultimate
ssb rsa2048/E058B91696C43666
created: 2019-02-03 expires: 2021-02-02 usage: E
The following key was revoked on 2019-02-03 by RSA key D4C0627A07510C6C Mustafa <mustafa91@gmail.com>
ssb rsa2048/38616BDAE66E418C
created: 2019-02-03 revoked: 2019-02-03 usage: S
[ultimate] (1). Mustafa <mustafa91@gmail.com>
尝试验证旧签名并查看其失败。
$ gpg --verify test.txt.asc test.txt
gpg: Signature made Sun Feb 3 21:49:43 2019 +03
gpg: using RSA key 485FC77FC73DA3B800C7F41538616BDAE66E418C
gpg: Good signature from "Mustafa <mustafa91@gmail.com>" [ultimate]
gpg: WARNING: This subkey has been revoked by its owner!
gpg: reason for revocation: Key has been compromised
gpg: revocation comment: This key is now in the hands of the enemy.
但是,尝试使用吊销的密钥进行签名。
$ rm test.key.asc
$ gpg --armor --detach-sign --default-key 38616BDAE66E418C test.txt
gpg: using "38616BDAE66E418C" as default secret key for signing
为什么它不会失败?如何验证?
$ gpg --verify test.txt.asc test.txt
gpg: Signature made Sun Feb 3 21:53:11 2019 +03
gpg: using RSA key 5DD923FBCF6392A5CB366167D4C0627A07510C6C
gpg: Good signature from "Mustafa <mustafa91@gmail.com>" [ultimate]
看看你最后的两段摘录。尽管您指定了要38616BDAE66E418C
的默认签名密钥,但当您执行验证时,会报告已使用 D4C0627A07510C6C
进行签名。
如果使用 gpg
-v
的详细选项,您将看到,如果指定的默认密钥被撤销,它将回退到下一个可用的签名密钥。
为了说明这一点,我重新创建了您的场景:
sec rsa2048/4E5CB15076F1318E
created: 2019-02-09 expires: 2021-02-08 usage: SC
trust: ultimate validity: ultimate
ssb rsa2048/3303CBB274AECA3B
created: 2019-02-09 expires: 2021-02-08 usage: E
The following key was revoked on 2019-02-09 by RSA key 4E5CB15076F1318E Herp Derp <herp@derp.com>
ssb rsa2048/8ABD3900E64E7972
created: 2019-02-09 revoked: 2019-02-09 usage: S
[ultimate] (1). Herp Derp <herp@derp.com>
在吊销之前使用子项签名:
$ gpg -v --armor --detach-sign --default-key 8ABD3900E64E7972 test.txt
gpg: using pgp trust model
gpg: using "8ABD3900E64E7972" as default secret key for signing
gpg: using subkey 8ABD3900E64E7972 instead of primary key 4E5CB15076F1318E
gpg: writing to 'test.txt.asc'
gpg: RSA/SHA256 signature from: "8ABD3900E64E7972 Herp Derp <herp@derp.com>"
吊销后使用子项签名:
$ gpg -v --armor --detach-sign --default-key 8ABD3900E64E7972 test.txt
gpg: Note: signature key 8ABD3900E64E7972 has been revoked
gpg: using pgp trust model
gpg: using "8ABD3900E64E7972" as default secret key for signing
gpg: Note: signature key 8ABD3900E64E7972 has been revoked
gpg: writing to 'test.txt.asc'
gpg: RSA/SHA256 signature from: "4E5CB15076F1318E Herp Derp <herp@derp.com>"
您可以看到,在第二个示例中,gpg 将子项标识为已吊销并回退到主键。