Copiosus vs Duo Messenger

Copiosus is just another P2P chat application. This software is provided "as is" without warranties or conditions of any kind, either expressed or implied. Please download this app only if: - You care about security. - You don't care about a beautiful UI. - You like to try apps other than WhatsApp and Signal. Features: - Send messages. - Send files and images. - Block users. - Two factor authentication (MFA) - End-to-end encryption using an asymmetric key. - Improved end-to-end security using a security key as a second factor which encrypts data using a shared symmetric key. - Minimal privileges required. - No in app purchases. - No ads. How does end-to-end encryption work in this app: 1. Whenever you send a message M a random symmetric key R is generated 2. R is encrypted using the asymmetric (public) key of the other user resulting in A 3. M is encrypted with R resulting in N 4. If security key S is set: N is encrypted by S 5. N and A is sent to the destination

Duo Messenger is your go-to secure and private messaging app. Designed with privacy at its core, Duo Messenger cares about the security of your data, ensuring it remains inaccessible to anyone else. - SECURE MESSAGE PRIVACY Duo Messenger is designed to prioritize your privacy. Your messages are encrypted end-to-end, guaranteeing that only you and your intended recipient can access them. Duo Messenger ensures that every message is safeguarded from illegal decryption or unauthorized access. Duo Messenger's advanced security measures always maintain the confidentiality and integrity of your communications at all times. - GUARANTEE USER ANONYMITY Duo Messenger is dedicated to providing complete anonymity to its users. Each user is given a unique Duo Number, which allows you to chat with others without revealing your phone number or email address. While you can access your account using your phone number or email, this information remains private and cannot be accessed by anyone else in any way. - NO ADS, NO TRACKERS Duo Messenger is completely ad-free, providing a smooth and clean user experience. You can enjoy uninterrupted and focused communication without the distraction of advertisements. Additionally, Duo Messenger does not track user activity within the app or share user data with third parties. Customer Service: support@duomessenger.app --- Terms: https://duomessenger.app/terms.html