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Chat safety/security
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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.
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 voice/video calls
Be advised
- There is no option for disabling Letter Sealing as it is a means of enhancing security and protection on LINE.
- After transferring your LINE account, Letter Sealing may prevent you from viewing messages sent and received in the past. In this case, refer to "This message can't be displayed" appears and I can't see chat messages.
To verify whether Letter Sealing is enabled, follow the steps below and if key fingerprints are visible, it indicates that the feature is active.
Useful info
Key fingerprints are unique encryption keys that Letter Sealing gives to each user so they can send messages to one another safely and securely. The actual keys are kept secret and will not appear in LINE chats. If your key fingerprint matches that of your friend, it means your chat is securely encrypted.
To compare key fingerprints:
1. Tap the menu icon at the top of a chat screen.
2. Tap This chat is protected with Letter Sealing at the bottom of the screen.
Note:
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.
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 voice/video calls
Be advised- After transferring your LINE account, Letter Sealing may prevent you from viewing messages sent and received in the past. In this case, refer to "This message can't be displayed" appears and I can't see chat messages.
Useful info1. Tap the menu icon at the top of a chat screen.
2. Tap This chat is protected with Letter Sealing at the bottom of the screen.
Note:
- This won't appear if Letter Sealing is turned off. In this case, tap the Home tab > Settings > Privacy > and turn ON Letter Sealing.
- Tap here to go to Settings from your smartphone.
3. Compare the key fingerprints on your device and your friend's device.
Note: To compare key fingerprints with your friend, we recommend meeting face-to-face or using a form of communication you trust.
Note: You need to verify your identity to send messages on LINE for PC with Letter Sealing enabled on the smartphone version of LINE.
To verify your identity:
1. Restart LINE on your smartphone.
2. Log in to LINE for PC.
3. Open a chat from the chats icon on the main menu.
4. Click Verify my identity and get a verification code.
5. Enter the verification code on the identity verification screen that appears in the smartphone version of LINE.
3. Compare the key fingerprints on your device and your friend's device.
Note: To compare key fingerprints with your friend, we recommend meeting face-to-face or using a form of communication you trust.
What to do if the verification code input screen doesn't appear on the smartphone version of LINE when verifying your identity for Letter Sealing on LINE for PC
Follow the steps below to verify your identity.Note: You need to verify your identity to send messages on LINE for PC with Letter Sealing enabled on the smartphone version of LINE.
To verify your identity:
1. Restart LINE on your smartphone.
2. Log in to LINE for PC.
3. Open a chat from the chats icon on the main menu.
4. Click Verify my identity and get a verification code.
5. Enter the verification code on the identity verification screen that appears in the smartphone version of LINE.
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