![]() ![]() ![]() Threema offers a "Validation Logging" feature that makes it possible to confirm that messages are end-to-end encrypted using the NaCl Networking and Cryptography library. Threema uses asymmetric ECC-based encryption, with 256-bit strength. The encryption process used by Threema is based on the open-source library NaCl library. Once a message is delivered successfully, it is immediately deleted from the servers. The application then encrypts all messages and files that are sent to other Threema users with their respective public keys. During the initial setup, the application generates a key pair and sends the public key to the server while keeping the private key on the user's device. The entire communication via Threema is end-to-end encrypted. The application does prevent screenshots in conversations. The application does not allow the self-deletion of messages after a period defined by the interlocutors. The calls are person-to-person with group calls unavailable. ![]() Threema launched support for end-to-end encrypted video calls on August 10, 2020. TOX VS CRYPTOCAT ANDROIDThreema optionally supports Android Wear smartwatch and Android Auto. With Threema Web, a client for web browsers, Threema can be used from other devices like desktop computers, though only as long as the original device is online. NET (Windows Phone)Įnglish, German, French, Spanish, Italian, Russian, Brazilian Portuguese, Polish, Rumantsch GrischunĮncrypted instant messaging & voice calling Īt the end of July, 2021 Threema introduced the ability for companies to host the messenger on their own server, primarily intended for companies with significantly high privacy concerns. As of May 2021, Threema had 10 million users and the business version, Threema Work, was used by 2 million users across 5,000 companies and organizations. The servers are in Switzerland and the development is based in Pfäffikon SZ. Threema is developed by the Swiss company Threema GmbH. It is also possible to create polls in personal or group chats. Users can make voice and video calls, send text and voice messages, multimedia, locations, and files of any type (up to 50 MB per file). In addition to one-on-one chats, Threema offers group chats up to 256 people. A web app version, Threema Web, can be used on desktop devices, but only as long as the phone with the Threema installation of the user is online. In addition to text messaging, users can make voice and video calls, send multimedia, locations, voice messages, and files. ![]() TOX VS CRYPTOCAT VERIFICATIONThe verification level of each contact is displayed in the Threema application as dots next to the corresponding contact. Threema knows three levels of authentication (trust levels of the contact's identity). Using this strong authentication feature, users can make sure they have the correct public key from their chat partners, which provides additional security against a Man-in-the-middle attack. TOX VS CRYPTOCAT CODEThe QR code contains the public key of the user, which is cryptographically tied to the ID and will not change during the lifetime of the identity. Users can verify the identity of their Threema contacts by scanning their QR code when they meet physically. Hence, the service can be used anonymously. Linking a phone number or email address to a Threema ID is optional. It is possible to find other users by phone number or email address if the user allows the app to synchronize their address book. Threema uses a user ID, created after the initial app launch by a random generator, instead of requiring a linked email address or phone number to send messages. This helps anonymize the users to a degree. The service claims to be based on the privacy by design principles by not requiring a phone number or other personally identifiable information. ![]()
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