{
  "title": "FutoIn 'sec' field - Master MAC",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "msid",
    "algo",
    "kds",
    "sig"
  ],
  "properties": {
    "msid": {
      "type": "string",
      "description": "Unique Master Secret ID"
    },
    "algo": {
      "type": "string",
      "description": "MAC algo name as defined in FTN8"
    },
    "kds": {
      "type": "string",
      "description": "Key Derivation Strategy"
    },
    "prm": {
      "type": "string",
      "description": "KDS parameter, if applicable"
    },
    "sig": {
      "type": "string",
      "description": "Base64 encoded MAC"
    }
  }
}