LINE

Letter Sealing is a feature that uses a technology known as end-to-end encryption (E2EE) to prevent anyone other than the members of a chat from seeing the contents of a chat on LINE.

E2EE is a method of communicating that ensures only the sender and recipient can decipher message content. The messages are also stored on servers in an encrypted state. This feature lets users send and receive messages with enhanced security when both sender and receiver have Letter Sealing enabled.
Note: To have Letter Sealing enabled in a group chat, all group members (up to 50 members) need to have Letter Sealing turned on.

Letter Sealing is currently turned on by default so users can exchange messages in chats more securely and safely.

Letter Sealing encrypts:
• Text messages (not including messages sent through other services like YouTube)
• Location information
• 1-on-1 group voice/video calls
• Photos/Videos/Voice messages
• Files

If you use LINE for PC with Letter Sealing enabled on the smartphone version of LINE, you will be required to verify your identity the first time you send a message. To verify your identity, refer to the following steps.
Note: You'll need your smartphone to complete the verification process.

To verify your identity:
1. Log in from LINE for PC.
2. Open a chat from on the main menu.
3. Click Verify my identity and get a verification code.
4. Enter the verification code on the identity verification screen that appears in the smartphone version of LINE.

Note: If you're trying to verify your identity so you can use Letter Sealing on LINE for PC, but the verification code entry screen isn't appearing in LINE on your smartphone, try restarting the smartphone version of LINE.