Why? Please you need to learn a lot to even ask good questions? just asking if x is hackable is no use. In principle if there is extremely intelligent person(s) - perhaps they can hack everything. Or even if your other contact is stupid it can happen? What if the other person you are talking to is a spy? there is no limit...
Ask in Briar forums or read a learn IT-security.
https://www.coursera.org/specializations/it-fundamentals-cybersecurity