How to use the encrypt.pl
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1. Create a file called .passphrase in /etc/mysql-zrm/<backup set name> 
   directory and put the passphrase to be used for encryption in this file.

2. chmod 700 /etc/mysql-zrm/<backup set name>/.passphrase

3. Modify the mysql-zrm.conf file in the relavant backup-set directory
   (/etc/mysql-zrm/<backup set name>/mysql-zrm.conf) and add the
   following line to the configuration file.

   encrypt-plugin="/usr/share/mysql-zrm/plugins/<backup set name>/encrypt-plugin.pl"

4. Modify the mysql-zrm.conf file mentioned above and add the following line

   passfile="/etc/mysql-zrm/<backup set name>/.passphrase"


