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LINE has developed a feature that ensures that the content of chats and calls can only be seen by the people participating in them. This is made possible through the development and implementation of an end-to-end encryption technology called Letter Sealing.

ing to our privacy experts, Signal is probably the most secure messaging app. Its open-source encryption protocol has become the industry standard for end-to-end message and voice encryption. And Signal is funded by donations and grants, so it isn't incentivized to monetize data.

1. Open the Android Market app on your device and the Secret Message app. Enter a secret key into the Secret Key box at the top of the app's screen, type the message you want to encrypt into the Message box, tap “Encrypt” and tap “Send via SMS” to send the encrypted message.

How secure is Line? Line offers end-to-end encryption, provided users opt-in to this feature – the app calls it “Letter Sealing”. You can register to the app using either your phone number or Facebook log-in.

To start a conversation with a LINE user, the LINE user must first add you as a friend. When the administrator authorizes you to connect with LINE accounts, you will receive the information that LINE users need to add you as a friend. You can find the information on the LINE connection in your profile.

Overall, Signal is likely the most secure messaging app in 2023, considering the strength of its security features, the power of its end-to-end encryption protocol, and its open-source code base. It features disappearing messages and can be secured with a password.

Line was launched in Japan in June 2011 by NHN Japan, a subsidiary of Naver Corporation. Because it was tailored to Japanese consumers' tastes and offered free smartphone calls as well as texting, with the help of a massive marketing campaign it quickly outpaced its existing rival KakaoTalk for the Japanese market.