Deuxdrop is a secure messaging system designed for mobile phones and desktops. The messaging protocol is distributed similar to email but built with real security/identity and contact addressing similar to chat systems like jabber.
Peer-to-peer encrypted messaging and forums
Messages are stored securely on your device, not in the cloud
Connect directly with nearby contacts - no Internet access required
SUM is a simple secure desktop instant messenger for local networks. No server infrastructure is needed. User find each other by registering in a file which will be stored at a shared network folder or optionally by an simple backend written in php. The communication between users is RSA encrypted.
... [More] User can verify the identity of the other users by sharing their public keys. SUM is ideal for communication in company's because no messages will be stored anywhere. The integrated public/private key management allows a encrypted communication and ensures a tap-proof and tamper-proof messaging. [Less]
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