hi there can anyone tell me if its possible with php to use certificate to autenticate to a web application admin area instead of using common username and password?

and is there a vps web server that can encrypt the whole drive and database of my application, for it may contain sensitive data that client will be updating inside the app that wouldnt wont competitors to get there hands on. lets say they try to hack the web server but all files will be encrypted?

hope soneone could help.

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