/*
 * Copyright 2020 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

syntax = "proto3";

package fcp.secagg;

import "fcp/secagg/server/secagg_server_enums.proto";

option java_package = "fcp.secagg.server";
option java_multiple_files = true;

// Specifies the security and robustness requirements for an instance of secure
// aggregation
message SecureAggregationRequirements {
  // The adversary class against which to protect.
  AdversaryClass adversary_class = 1;

  // Fraction of clients in the population which might be compromised
  // by an adversary, expressed as a fraction (between 0.0 and 1.0).
  double adversarial_client_rate = 2;

  // Estimated client dropout rate, expressed as a fraction (between 0.0
  // and 1.0).
  double estimated_dropout_rate = 3;

  // The minimum number of (non-adversarial) users' values that must be
  // aggregated together before the server can gain access to the aggregate,
  // even transiently (e.g. in RAM).
  int32 minimum_clients_in_server_visible_aggregate = 4;
}