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LINE Letter Sealing: End-to-End Encryption for Secure Messaging

2025-09-18

LINE, a leading life platform, has introduced Letter Sealing, a powerful security feature that protects user messages with End-to-End Encryption (E2EE). This feature ensures that chat content remains confidential and can only be accessed by the sender and recipient.

Key Features

  • End-to-End Encryption (E2EE) for secure communication
  • Message encryption with keys stored only on user devices
  • Available on multiple platforms including iOS, Android, Windows, and Mac OS X
  • Initially applied to one-to-one chats and Location Sharing

How It Works

Letter Sealing encrypts messages with a key stored only on the user's device, making it technically impossible for the content to be disclosed on the server or to third parties. The feature is automatically enabled for Android users with a single device, while users with multiple devices or iOS users need to manually enable it in their settings.

Benefits

The introduction of Letter Sealing marks a significant enhancement in LINE's security features, aligning with its commitment to providing a secure communication platform. This feature is part of LINE's broader security initiatives, including Hidden Chat, time-limited messaging, and Passcode Lock.

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