If you have a private blog and you only need you to log into the WordPress admin system, you should ensure that your security is tight. One way of ensuring that no one can even try and log into WordPress is by only allowing your IP address to access the wp-login.php page (your IP address must be static otherwise you will have to do this each time you want to log in).
This can be done very simply be adding the following code to your .htaccess file:
<Files wp-login.php> order deny,allow Deny from all # Allow from this IP address allow from xx.xxx.xx.xx </Files>
All you need to do is replace the x’s with your own IP address and then you are the only one who can access the login page.