help

[sahar yousefi]

Hello
I'm working on asymmetric keys for encryption and decryption of files. I am going to encrypt data on sender PC using receiver's public key and send encrypted data to receiver in order to decrypt it using its private key.
 I have two PCs (A and B). I created a (public key, private key) on A and sent its public key to B. the public key is attached. Then I tried to encrypt a dir using "gpgdir" command. But I encountered below error. I'm wondered why gpg is looking for A's private key? Whenever we don’t want B knows the private key? How can I fix it?
 
============================================
# gpgdir --verbose -K el_ghasemi at yahoo.com -e /home/yousefi/Desktop/a
[+] import_perl_modules(): The @INC array:
/usr/local/lib64/perl5/site_perl/5.10.0/x86_64-linux-thread-multi
/usr/local/lib/perl5/site_perl/5.10.0
/usr/lib64/perl5/vendor_perl/5.10.0/x86_64-linux-thread-multi
/usr/lib/perl5/vendor_perl/5.10.0
/usr/lib/perl5/vendor_perl
/usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi
/usr/lib/perl5/5.10.0
/usr/lib/perl5/site_perl
.
[+] Executing: gpgdir --verbose -K el_ghasemi at yahoo.com -e /home/yousefi/Desktop/a
    Using GnuPG key: el_ghasemi at yahoo.com
    Enter password (for initial encrypt/decrypt test)
Password: 21961363
 
[+] test_mode(): Encrypt/Decrypt test of gpgdir_test.2902
[+] test_mode(): Created gpgdir_test.2902
Reading passphrase from file descriptor 9    
 
pub  1024R/18EA55AA 2011-05-30 ghasemi (this is a encrypt test) <el_ghasemi at yahoo.com>
 Primary key fingerprint: C4F9 1073 B733 C752 C18C  EF81 1BFC 4C86 58C0 723B
      Subkey fingerprint: D953 4E49 13CA 998C BF0F  3CE5 7E3A 9360 18EA 55AA
 
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
gpg: 18EA55AA: There is no assurance this key belongs to the named user
[+] test_mode(): Successful encrypt of gpgdir_test.2902
Reading passphrase from file descriptor 9    
    GnuPG errors:
gpg: encrypted with 1024-bit RSA key, ID 18EA55AA, created 2011-05-30
      "ghasemi (this is a encrypt test) <el_ghasemi at yahoo.com>"
gpg: decryption failed: secret key not available
    GnuPG status:
[GNUPG:] ENC_TO 7E3A936018EA55AA 1 0
[GNUPG:] NO_SECKEY 7E3A936018EA55AA
[GNUPG:] BEGIN_DECRYPTION
[GNUPG:] DECRYPTION_FAILED
[GNUPG:] END_DECRYPTION
[*] Created zero-size file: gpgdir_test.2902
    Bad password? Try with --verbose at /usr/bin/gpgdir line 642.
 
Best regards
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