Addresso Sharing

seq-diagram.md

sequenceDiagram
    participant Sender as Sender's Addresso App
    participant Server as Addresso Relay Server
    participant Receiver as Receiver's Addresso App

    Note over Sender: Generate 4-digit PIN
    Note over Sender: Derive symmetric key
    Note over Sender: Encrypt shared data
    Note over Sender: Sign Addresso share    

    Sender->>Server: Send encrypted data
    Server-->>Sender: Return 8-char reference

    Note over Sender: Generate base64 URL<br/>(reference + PIN)

    Note over Sender: Share URL with receiver

    Receiver->>Receiver: Unpack base64<br/>(extract reference & PIN)
    Receiver->>Server: Request data using reference
    Server-->>Receiver: Return encrypted data
    
    Note over Receiver: Derive symmetric key from PIN
    Note over Receiver: Decrypt data
    Note over Receiver: Display shared information<br/>and signing details

Loading