Hello. This is Shiho.
Here is today’s topic.
“Do you have a lock indicator icon on your LINE chat room? What the icon means and the function”
On 31 August 2016, “Letter Sealing” is enabled by default in supported versions of LINE (iPhone version and Android version) only for domestic users in Japan.
A lock indicator icon suddenly appeared on LINE chat room.
Accordingly many users seemed to be confused with a message “A lock icon (🔒) is displayed in Letter Sealing-enabled chats” which was displayed on chat room.
I will explain the details of “Letter Sealing” function for those who are totally new to the feature.
I am not going to talk about it from its technical perspective in this article.
What is “Letter Sealing” on LINE?
“Letter Sealing” is an end-to-end encryption (E2EE) that all the messages and calls on LINE chat room are sent as “code” so that only the sender and recipient have the “key” to break the code and read the contents.
Therefore, no one other than the sender and recipient can read their chats (even LINE servers cannot break the code and read the contents).
On “Letter Sealing”, even the managers of LINE servers cannot read the contents of messages on chat room
Is chat room without a lock indicator icon (protection prior to the “Letter Sealing” feature) dangerous?
Is texting and calling on chat room without a lock indicator icon dangerous? Introduction of a lock indicator icon made us feel that chat room without a lock indicator icon might have been dangerous.
Some users might misunderstand that a lock indicator icon means “they are blocked by the recipient”. Although “Letter Sealing” has nothing to do with blocking function. By an introduction of “Letter Sealing”, chat room without a lock indicator icon relatively looks dangerous.
Undoubtedly chat room without a lock indicator icon is not protected with end-to-end encryption.
On that point, chat room without a lock indicator icon looks dangerous compared with chat room with a lock indicator icon.
However, it does not mean that chat room without a lock indicator icon is dangerous and your chats will be leaked.
It is because messages on LINE are protected with all data strictly managed in compliance with Japan’s communication privacy laws even without “Letter Sealing”.
You can communicate on LINE chat room without worrying its safety even without “Letter Sealing”.