As far i know until now, the min version of a .js(javascript) file is obtaining by removing the unncessary blank spaces and comments, in order to reduce the file size.
My questions are:
Only the first question is most important and I'm looking for help on it.
TY
Multiple minifiers exists, that also are able to compress JS, see http://dean.edwards.name/weblog/2007/04/packer3 for one of the most being used. Some others exists, also see the JSMin library http://www.crockford.com/javascript/jsmin.html
The main advantage is the size gain. You should also aggregate your JS files when you have multiple JS files, this also saves a lot of I/O (less HTTP requests) between the server and the client. This is probably more important than minifying.
I can't answer you about encryption. Client security will mainly depend on its browser.
EDIT: Ok my first answer is not for the first question, merged both in 2.
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