By removing email and disconnecting your information system from the internet… . On a more serious note, you can’t be sure you’re 100% protected and you never will be. Also, our role is to accompany companies by installing tools and setting up procedures that allow by their complementarity, to dissuade the hacker from attacking you. For a hacker, time is money: the more time he spends preparing the attack against you, the less money he will (potentially) earn by running into difficulties. If this is the case, he will abandon his target, to try to attack another one…