Masters of magic arts are often keen on ensuring that their crafts’ secrets are not divulged to the wrong people. To that end (that is, to ensure that the secrets are not divulged), they use several strategies.
One way in which magic arts masters ensure that the secrets are not divulged is by ensuring that people being initiated into the crafts are solemnly sworn to strict secrecy.
Another way in which magic arts masters ensure that their secrets are not divulged is by ensuring that the secrets are only given to worthy people: people who can bear them and keep them protected.
Yet another way in which magic arts masters ensure that their secrets are not divulged is by ensuring that the communication between them and their students is only done on secure platforms. It is, for instance, unthinkable for a master to go to the www.gmail.com login page, once he has gone through the Gmail login page formalities, proceed to use the said email system to send a message containing secret information. And this is not withstanding the supposed security of the Gmail system. Indeed, even during face to face meetings, communication is typically symbolic or through encrypted language, in order to minimize the chances of leakage as much as possible.