I have a general question about security.
I've read somewhere on this forum that a good idea would be to rename the admin folder.
In order to be consistent with the indexer (google, yahoo, etc) the file robots.txt should contain the name of the folder admin in order for them not to index its content.
This way of doing will reveal the name of the admin folder in the entire world.

Does anyone of you have any suggestion in order not to revealing the name of the admin folder ?
Is it really mandatory to have the admin folder in the robots.txt ?
Thanks for you answer