Coffee ☕

Coffee is an open-source solution for secure, privacy-first data sharing. It combines a CLI tool with a coordinating server to enable global data transfers without exposing personal information. Only session keys are stored on the server, and all data is retrieved via a one-time access mechanism.

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Todo (Work in Progress)

Here’s what we are missing:

• 🚧 CLI Distribution

  • Publish pre-compiled binaries (Windows, macOS, Linux). If not possible: Deploy CLI via pip for Python users.

• 🚧 Server Deployment

  • Serverless deployment

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Features

• 🔒 Secure Data Transfer: Encrypt and share data without revealing user details.
• 🔑 Session Key Authentication: Unique session keys are generated per CLI installation for secure coordination.
• 🛡️ Password Protection: Data is encrypted with a user-defined password (never sent to the server).
• ⚡ One-Time Retrieval: Data is permanently deleted after successful access.
• 🕵️ Privacy-First: No personal data stored—only ephemeral session keys.

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Architecture

CLI

• Generates a unique session key on installation.
• Encrypts and uploads data to the server with a user-provided password.
• Manages local data loading and secure transfers.

Server

• Stores session keys and encrypted data temporarily.
• Enforces one-time retrieval: data is deleted upon access.
• Acts as a stateless coordinator (no long-term user data retention).

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Security & Privacy

• End-to-End Encryption: Data is encrypted client-side before transfer.
• Zero Knowledge: Passwords never leave the sender/recipient’s device.
• Ephemeral Storage: Server deletes data after retrieval or expiration.
• Session Key Rotation: Users can refresh keys to enhance security.

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Contributing

Contributions are welcome!

• Report issues or suggest features.
• Submit pull requests for CLI/server improvements.
• Help design deployment pipelines or packaging workflows.