[Figure 1] Letter Sealing
Sealing acted as a way of protecting messages from the many problems that may arise while it was being delivered, but the sealing method lost its significance with the waning popularity of hand-written messages. How are messages protected today? What methods are used to keep messages secure on modern communication methods? In the following sections, we will go over how LINE messages are kept secure from prying eyes.
The default encryption method used in LINE
Any modern mobile messaging app or social networking service has servers that store and send message data. Servers decrypt messages or other data that are sent by users and then send them back to the recipient. If the server cannot immediately deliver the data to the recipient, the data will be temporarily stored while the recipient receives a push notification that lets them know there is a new message.
Encryption is a vital piece of technology that keeps a message safe while being delivered from the messaging app to the server. LINE has also encrypted messages so that the various user information sent to the servers cannot be acquired and read by third parties. The process of encrypted communication between the messaging app on user devices and the server looks like [Figure 2] below.