{
  "properties": {
    "ssn": {
      "encrypt": {
        "keyId": {
          "$binary": "YWFhYWFhYWFhYWFhYWFhYQ==",
          "$type": "04"
        },
        "type": "string",
        "algorithm": "AEAD_AES_CBC_HMAC_SHA512-Deterministic"
      }
    }
  },
  "bsonType": "object"
}