Letter Sealing is a feature that provides end-to-end encryption (E2EE) for chat messages. E2EE is a communication system designed so that messages saved on our servers are encrypted and cannot be read by anyone except the sender and receiver of the message.
Note: To have Letter Sealing enabled in a group chat, all group members (up to 50 members) need to have Letter Sealing turned on.
Once the message sender and receiver have both turned on Letter Sealing, they will be able to start sending messages with added security.
Letter Sealing encrypts:
• Text messages (not including messages sent through other services like YouTube)
• Location information
• 1-on-1 voice/video calls
• Photos/Videos/Voice messages
• Files
Be advised
If you use LINE for iPad or PC after turning on Letter Sealing, you'll be required to verify your identity the first time you send a message by entering a verification code on the smartphone version of LINE.
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