'''Exercise 4 '''
Several software configurations can be done to help secure your use of Skype. Automatic login should be switched off. Be aware that chat history is by default recorded on your computer (this is not encrypted) and have a look at how to switch this option off and how to delete already recorded messages. Be aware that Skype allows you to login with the same account details from several different computers at the same time. Change your password regularly.
'''Exercise 5 '''
Register an account at https://ostel.me, download Jitsi and establish an encrypted voice or video chat with a colleague who has done the same.