Encrypted Messaging

Null Chat supports:

• text;
• replies;
• reactions;
• images;
• voice notes;
• encrypted attachments;
• message edits;
• message deletion requests;
• disappearing messages;
• payment actions;
• verification cards.

Direct-message flow

sequenceDiagram
    participant A as Alice
    participant C as Alice Client
    participant N as Null Relay
    participant B as Bob Client
    A->>C: Compose message
    C->>C: Encrypt on device
    C->>N: Send ciphertext
    N-->>B: Deliver encrypted payload
    B->>B: Decrypt on device
    B-->>N: Send delivery receipt if enabled
    N-->>C: Return receipt

The relay stores or forwards ciphertext. It should not receive plaintext message content or raw private keys.

Message state

Messages may have the following states: pending, sent, delivered, read (if enabled), expired, deleted locally, or failed.