Editing Verify downloaded file with gnupg

== Way to verify downloaded file with gnupg ==
* Download and install [http://www.gnupg.org/download/ GnuPG 1.4.11  compiled for Microsoft Windows]([ftp://ftp.gnupg.org/gcrypt/binary/gnupg-w32cli-1.4.11.exe download directly]).

* Locate the downloaded file at another website:(1)file.tar.gz.sig (GPG security signature) (2)file.tar.gz (3)keys.txt (GPG public keys from the website owner who offered files file.tar.gz.sig & file.tar.gz)
<pre>
C:\Program Files\GNU\GnuPG\
* gpg.exe
* file.tar.gz.sig                     
* file.tar.gz                         
* keys.txt                            
</pre>

* open the console window
*# cmd > C:\Program Files\GNU\GnuPG>gpg --import keys.txt
*# cmd > C:\Program Files\GNU\GnuPG>gpg --verify file.tar.gz.sig file.tar.gz

Expected result after executed --verify command: 

 gpg: Good signature from ...

== Troubleshooting ==
I met the message "Can't check signature: public key not found" after I executed --verify command
* Solution: need to import the GPG public keys '''gpg --import keys.txt'''

== further reading ==
* [http://www.gnupg.org/docs.html GnuPG documentation]
* {{Mac}} [http://notepad2.blogspot.tw/2012/07/mac-os-x-how-to-generate-md5-sha1.html Mac OS X: how to generate md5 sha1 sha256 checksums from command line]
* related terms: MD5 or SHA1 Checksum

"Calculate the md5 hash of a string"
* [https://www.php.net/manual/en/function.md5.php PHP: md5 - Manual]
* [https://dev.mysql.com/doc/refman/5.5/en/encryption-functions.html MySQL :: MySQL 5.5 Reference Manual :: 12.13 Encryption and Compression Functions]

[[Category:Security]] [[Category:Software]]