When Boris receives it, he must use his key to decrypt it into a readable message.
Some end-to-end encrypted instant messaging services use their own protocol.
So, for instance, users of Signal on Android and i OS can chat securely with others who use those programs.
Standard text (SMS) messages do not offer end-to-end encryption.
If you want to send encrypted messages on your phone, consider using encrypted instant messaging software instead of text messages.
However as your conversation travels through the phone network, it's vulnerable to interception by your phone company and, by extension, any governments or organizations that have power over your phone company.
The easiest way to ensure you have end-to-end encryption on voice conversations is to use Vo IP instead. Most popular Vo IP providers, such as Skype and Google Hangouts, offer transport encryption so that eavesdroppers cannot listen in, but In order to have end-to-end encrypted Vo IP conversations, both parties must be using the same (or compatible) software.
It is as basic as putting on your seat belt when you drive. When you send email using HTTPS, your email provider still gets an unencrypted copy of your communication.
Governments and law enforcement may be able to access this data with a warrant.
Telecommunication networks and the Internet have made communicating with people easier than ever, but have also made surveillance more prevalent than it has ever been in human history.