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2009-11-21 expires: 2010-01-20 usage: E

[ full ] (1). fahad (IK2206)

Please note that the shown key validity is not necessarily correct

unless you restart the program.

We can also check the signature and the trust level by using -check-sig and -check-trust commands respectively.

E:\ Labs \1>gpg --check-

pub 1024D/96DD7072 2009-11-21 [expires: 2009-12-19]

uid Khan Muhammad Tauseef (IK2206)

sig!3 96DD7072 2009-11-21 Khan Muhammad Tauseef (IK2206)

sig! 242C87B7 2009-11-25 fahad (IK2206)

uid Muhammad Tauseef Khan (IK2206)

sig!3 96DD7072 2009-11-21 Khan Muhammad Tauseef (IK2206)

sig! 6C14565D 2009-11-21 Internet Security and Privacy (Course key)

sig! 242C87B7 2009-11-25 fahad (IK2206)

sub 1024g/9D6213BB 2009-11-21 [expires: 2009-12-19]

sig! 96DD7072 2009-11-21 Khan Muhammad Tauseef (IK2206)

2 signatures not checked due to missing keys
E:\Labs\1>gpg --check-trust

gpg: 3 marginal(s) needed, 1 complete(s) needed, PGP trust model

gpg: depth: 0 valid: 1 signed: 3 trust: 0-, 0q, 0n, 0m, 0f, 1u

gpg: depth: 1 valid: 3 signed: 0 trust: 1-, 0q, 0n, 0m, 2f, 0u

gpg: next trustdb check due at 2009-12-19

· How to verify signed e-mails with GPG

Email messages can be verified by using the option -verify. For example, verifying a message named “part5.asc” is.

E:\ >gpg --verify part5.asc

gpg: Signature made 11/21/09 15:59:46 W. Europe Standard Time using DSA key ID 6C14565D

gpg: Good signature from 'Internet Security and Privacy (Course key)

gpg: aka 'Internet Security and Privacy'

gpg: aka 'Internet Security and Privacy '

gpg: aka 'Internet Security and Privacy

gpg: aka 'Internet Security and Privacy'

gpg: WARNING: This key is not certified with a trusted signature!

gpg: There is no indication that the signature belongs to the owner.

Primary key fingerprint: 00E2 5F48 4127 488C 51EC 08DE B367 D505 6C14 565D

The first line tells about the key used to make the signature and the time when the signature was made. The next line tells us that the signature is “good” or valid with the confirmation of the userid of that key Internet Security and Privacy (Course key) . The WARNING indicates that the key used to make the signature is not “trusted”.

Another example is for “bad signature”.

E: >gpg --verify part4.asc

gpg: Signature made 11/21/09 15:59:46 W. Europe Standard Time using DSA key ID 6C14565D

gpg: BAD signature from 'Internet Security and Privacy (Course key)'

This means that the file has been changed in transit or altered somehow.


·如何使用GPG进行邮件签名—— How to sign e-mails with GPG
The command -sign is used to make signature on a message. The document to sign is the input and the signed document is the output. It is also possible to change the format of the output to ascii-armor by using -armor option. GPG uses our secret key for signing and therefore it will need the passphrase to be inputted. Following is an example.

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