About the Proxy Re-encryption Demonstrator

Die zwei Demonstrator-Modi

Getting Started

• Register a new user
  Open /register and choose a unique username. If the selected username is already taken, the registration button is disabled and a notification such as "user" is not available. is displayed.
• Download and store your keypair
  After successful registration your cryptographic keypair is generated locally. Export it immediately using the download button and store it securely. The exported keypair is required later to log in again and to decrypt your messages. If the keypair is lost, encrypted messages cannot be recovered.
• Create Proxy Re-encryption Keys
  Open your user profile and switch to the Re-keys tab. Here you can create or delete re-encryption keys for other users. A re-encryption key authorizes the proxy to transform ciphertexts intended for you into ciphertexts decryptable by the selected recipient.
• Send encrypted messages
  Navigate to /users, select a recipient and send an encrypted message. Messages are encrypted inside the browser before transmission.
• Read your messages
  Incoming messages appear in the Messages section of your profile. Clicking a message decrypts it locally using your private key. If a corresponding re-encryption key exists, transformed ciphertexts can likewise be decrypted by the authorized recipient.

• Json Example Data
• Chat.json — example encrypted conversations
• Username.json — example public keys and re-encryption keys of Username (replace with real username)

Further Information

• Proxy Re-encryption (Wikipedia)
• Cryptographic scheme implementation
• Demonstrator source code
• Sherman S. M. Chow, Jian Weng, Yanjiang Yang, Robert H. Deng: "Efficient Unidirectional Proxy Re-encryption"
• Report bugs or feature requests