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be encrypt & sign”. Following is an example.

E:\step 10>gpg --armor --output 4step10signed.asc --sign --encrypt 4signstep10.txt

You need a passphrase to unlock the secret key for

user: 'Khan Muhammad Tauseef (IK2206)'

1024-bit DSA key, ID 96DD7072, created 2009-11-21

You did not specify a user ID. (you may use '-r')

Current recipients:

Enter the user ID. End with an empty line:

Current recipients:

1024g/9D6213BB 2009-11-21 'Muhammad Tauseef Khan (IK2206) '

Enter the user ID. End with an empty line:

gpg: B05617AA: There is no assurance this key belongs to the named user

pub 2048g/B05617AA 2009-10-19 Internet Security and Privacy

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

Subkey fingerprint: 332C 0FD9 146B 75A2 7D2D 06D9 D843 960F B056 17AA

It is NOT certain that the key belongs to the person named

in the user ID. If you *really* know what you are doing,

you may answer the next question with yes.

Use this key anyway? (y/N) y

Current recipients:
2048g/B05617AA 2009-10-19 'Internet Security and Privacy'

1024g/9D6213BB 2009-11-21 'Muhammad Tauseef Khan (IK2206) '

Enter the user ID. End with an empty line:

· Examples of encrypted and signed messages

We need -decrypt command to decrypt the encrypted and signed messages. Following are few responses of decryption of different parts of message.

e:\step 10>gpg --output 11.asc --decrypt 11.txt

You need a passphrase to unlock the secret key for

user: 'Khan Muhammad Tauseef (IK2206)'

1024-bit ELG key, ID 9D6213BB, created 2009-11-21 (main key ID 96DD7072)

gpg: encrypted with 2048-bit ELG key, ID B05617AA, created 2009-10-19

'Internet Security and Privacy (Course key)'

gpg: encrypted with 1024-bit ELG key, ID 9D6213BB, created 2009-11-21

'Khan Muhammad Tauseef (IK2206)'

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 outputted decrypted message is 3ad2e2a0b15d0e9f823c57fe44fefa2a870d30fa and following is the message that we inputted for decryption.

-----BEGIN PGP MESSAGE-----

Version: GnuPG v2.0.9 (GNU/Linux)

hQEOA94pXdqdYhO7EAP+OUJF1wcMLszzu6YIVcXOOKckhChdM8LKX2FCUmBIuObn

DGThocqob1L4LLhSQlvLQI2RlZ8Y+AmPYpKapOO3AWC63thDjmw3LWcYNumZHZTZ

JLJj+3cLb67kjSn3rVRunrBsEuyON3j6ARuh0e3C1qsRi8BGs/p4OfFoYTEGa7AD

/3pHj347wjRhQEYsjhihDw3UgTTpK2ntJbqXQCrQpO7QyqTQ84i+thFyrhhiSiHM

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