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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 // |
| 5 // Contains information collected by the RAPPOR (Randomized Aggregatable |
| 6 // Privacy-Preserving Ordinal Responses) system. |
| 7 // |
| 8 // For a full description of the rappor metrics, see |
| 9 // http://www.chromium.org/developers/design-documents/rappor |
| 10 |
| 11 syntax = "proto2"; |
| 12 |
| 13 option optimize_for = LITE_RUNTIME; |
| 14 |
| 15 package rappor; |
| 16 |
| 17 // Next tag: 3 |
| 18 message RapporReports { |
| 19 // Which cohort these reports belong to. The RAPPOR participants are |
| 20 // partioned into cohorts in different ways, to allow better statistics and |
| 21 // increased coverage. In particular, the cohort will serve to choose the |
| 22 // hash functions used for Bloom-filter-based reports. The cohort is |
| 23 // generated randomly by the client and is currently in the range [0,32). |
| 24 optional int32 cohort = 1; |
| 25 |
| 26 // Each Report contains the values generated by the RAPPOR process for one |
| 27 // metric. |
| 28 message Report { |
| 29 // The name of the metric, hashed (first 8 bytes of MD5 hash). |
| 30 optional fixed64 name_hash = 1; |
| 31 |
| 32 // The sequence of bits produced by random coin flips in |
| 33 // RapporMetric::GetReport(). For a complete description of RAPPOR |
| 34 // metrics, refer to the design document at: |
| 35 // http://www.chromium.org/developers/design-documents/rappor |
| 36 optional bytes bits = 2; |
| 37 } |
| 38 repeated Report report = 2; |
| 39 } |
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