Data

Core Requirements

• core model data must be handled in a ‘no-knowledge’ way
• however models can be shared across users
• structures for remote calculation elements must be anonymised

Structure

Envelope

• not encrypted
• structured but extensible - JSON..?
• searchable only on id’s

 {
    owners: {
        id #1: encryrption key encrypted by user 1's public key
        id #2: encryrption key encrypted by user 2's public key
    }
    versions: {
        model:
            encryption: [SHA-512|CRYTALS-Kyber|...]
    }
}

Model

• encrypted
• BLOB for size efficiency (not speed)
• metadata
• map
  • used to anonymize values
• values
  • 3D (maybe more?) array of values
  • can be sent unencrypted for remote calculation
  • x axis: time
  • y axis: numerical value
  • z axis: scenarios
  • each row
    • metadata
      • type
      • formula
      • calculation cost factor
      • dirty state
      • values…

Issues

• how model lookup values?
  • if ranges - e.g. tax