Cwa-app-ios: Duplicate keys in the exposure check log

Created on 22 Aug 2020  路  8Comments  路  Source: corona-warn-app/cwa-app-ios

Avoid duplicates

  • [X] Bug is not mentioned in the FAQ
  • [X] Bug is not already reported in another issue

Describe the bug

The iOS app downloads the same key packages over and over again. IMO only the keys which were published after the last synchronization should be fetched from the server. This approach has three benefits:

  • it improves the server performance by limiting the request load
  • it speeds up the exposure check on the mobile device
  • it doesn't give the false impression that dozens of key packages are published every day

Proof:

$ grep Hash ExposureChecks-2020-08-22.json | sort | uniq | wc -l
      20
$ grep Hash ExposureChecks-2020-08-22.json | wc -l
     100


ExposureChecks-2020-08-22.json

Example: the D34545397E3CCEAA63241BE346D55D83AB3F5C8B841464A7701138B3E033B756 hash was downloaded 5 times over the last few days.

json { "Build" : "18A5351d", "ExportVersion" : 1, "ExposureChecks" : [ { "Hash" : "9834E005A724EC22DE70E2CC43E3A2D4A9B8EEEFBE5819DB8106DBC282E31747", "RandomIDCount" : 3940, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-15 02:46:14 +0200" }, { "Hash" : "C2ABBD2EDFE0B6142B276772DC7827970BDA7D1C5DB0A29BB3B9324168CAFDA2", "RandomIDCount" : 3020, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-15 02:46:14 +0200" }, { "Hash" : "A7397D370364D7161218210E99EEAC01036894CEE5552C5D92BE644C33D3A0DD", "RandomIDCount" : 1385, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-16 05:25:38 +0200" }, { "Hash" : "833616C7F071A6588C27CAB55A817F5FFF827A432FE9515D9F92CC7468241371", "RandomIDCount" : 1645, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-16 05:25:38 +0200" }, { "Hash" : "FC11A5902E8AF6B0D553FA3EFE177FE58F274C8B9C2F8CD8599CE731D3D94033", "RandomIDCount" : 2813, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-16 05:25:38 +0200" }, { "Hash" : "8C9B1750B841C0438F59DE8A24A757C607293E143513895B2DEBEB2365F5FFC0", "RandomIDCount" : 2415, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-16 05:25:38 +0200" }, { "Hash" : "D34545397E3CCEAA63241BE346D55D83AB3F5C8B841464A7701138B3E033B756", "RandomIDCount" : 3050, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-16 05:25:38 +0200" }, { "Hash" : "66A963F473CA62E4AE272C1592B2C45F7ADEF47A1B9FE82CD77DB5988788AA23", "RandomIDCount" : 2210, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-16 05:25:38 +0200" }, { "Hash" : "26C8E16D66F0FC1679BCF9A97183337AFD854CD72BF4938EC43B2DF4CEAEE5F2", "RandomIDCount" : 1655, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-16 05:25:38 +0200" }, { "Hash" : "F7249967A905848A41AA56C4B99BEFC5A4763F88635FFA89C97256752187FE8C", "RandomIDCount" : 565, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-16 05:25:38 +0200" }, { "Hash" : "254AAD2606244A9B0EE948D7F529CEF82EB0D79D7C4676BD032D72D47790B5C4", "RandomIDCount" : 2380, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-16 05:25:38 +0200" }, { "Hash" : "A18E806F1CEFF5943A93A1AD4057286209E59B7B30CD627DBF695D5DE5EA5BC2", "RandomIDCount" : 2285, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-16 05:25:38 +0200" }, { "Hash" : "3BD10320781C1E71D844AD787C7B5F3BF34FC9AC19EE4DDB85ABF6736B2CFBEB", "RandomIDCount" : 3800, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-16 05:25:38 +0200" }, { "Hash" : "9834E005A724EC22DE70E2CC43E3A2D4A9B8EEEFBE5819DB8106DBC282E31747", "RandomIDCount" : 3940, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-16 05:25:38 +0200" }, { "Hash" : "C2ABBD2EDFE0B6142B276772DC7827970BDA7D1C5DB0A29BB3B9324168CAFDA2", "RandomIDCount" : 3020, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-16 05:25:38 +0200" }, { "Hash" : "181702660F5033305B36E34F014322D1D76EC86CF378EAF1F6E36AADD8892D89", "RandomIDCount" : 2675, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-16 05:25:38 +0200" }, { "Hash" : "833616C7F071A6588C27CAB55A817F5FFF827A432FE9515D9F92CC7468241371", "RandomIDCount" : 1645, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-17 08:46:53 +0200" }, { "Hash" : "FC11A5902E8AF6B0D553FA3EFE177FE58F274C8B9C2F8CD8599CE731D3D94033", "RandomIDCount" : 2813, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-17 08:46:53 +0200" }, { "Hash" : "8C9B1750B841C0438F59DE8A24A757C607293E143513895B2DEBEB2365F5FFC0", "RandomIDCount" : 2415, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-17 08:46:53 +0200" }, { "Hash" : "D34545397E3CCEAA63241BE346D55D83AB3F5C8B841464A7701138B3E033B756", "RandomIDCount" : 3050, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-17 08:46:53 +0200" }, { "Hash" : "66A963F473CA62E4AE272C1592B2C45F7ADEF47A1B9FE82CD77DB5988788AA23", "RandomIDCount" : 2210, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-17 08:46:53 +0200" }, { "Hash" : "26C8E16D66F0FC1679BCF9A97183337AFD854CD72BF4938EC43B2DF4CEAEE5F2", "RandomIDCount" : 1655, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-17 08:46:53 +0200" }, { "Hash" : "F7249967A905848A41AA56C4B99BEFC5A4763F88635FFA89C97256752187FE8C", "RandomIDCount" : 565, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-17 08:46:53 +0200" }, { "Hash" : "254AAD2606244A9B0EE948D7F529CEF82EB0D79D7C4676BD032D72D47790B5C4", "RandomIDCount" : 2380, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", 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"de.rki.coronawarnapp", "Timestamp" : "2020-08-17 08:46:53 +0200" }, { "Hash" : "6E8A32A45BE0EC51E325A5F3A8E7B5B9A4B3A766F2CB2DF732746ABDBDFF03F0", "RandomIDCount" : 1790, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-17 08:46:53 +0200" }, { "Hash" : "FC11A5902E8AF6B0D553FA3EFE177FE58F274C8B9C2F8CD8599CE731D3D94033", "RandomIDCount" : 2813, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-18 09:06:23 +0200" }, { "Hash" : "8C9B1750B841C0438F59DE8A24A757C607293E143513895B2DEBEB2365F5FFC0", "RandomIDCount" : 2415, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-18 09:06:23 +0200" }, { "Hash" : "D34545397E3CCEAA63241BE346D55D83AB3F5C8B841464A7701138B3E033B756", "RandomIDCount" : 3050, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-18 09:06:23 +0200" }, { "Hash" : "66A963F473CA62E4AE272C1592B2C45F7ADEF47A1B9FE82CD77DB5988788AA23", "RandomIDCount" : 2210, 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09:49:20 +0200" }, { "Hash" : "3BD10320781C1E71D844AD787C7B5F3BF34FC9AC19EE4DDB85ABF6736B2CFBEB", "RandomIDCount" : 3800, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-21 09:49:20 +0200" }, { "Hash" : "9834E005A724EC22DE70E2CC43E3A2D4A9B8EEEFBE5819DB8106DBC282E31747", "RandomIDCount" : 3940, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-21 09:49:20 +0200" }, { "Hash" : "C2ABBD2EDFE0B6142B276772DC7827970BDA7D1C5DB0A29BB3B9324168CAFDA2", "RandomIDCount" : 3020, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-21 09:49:20 +0200" }, { "Hash" : "181702660F5033305B36E34F014322D1D76EC86CF378EAF1F6E36AADD8892D89", "RandomIDCount" : 2675, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-21 09:49:20 +0200" }, { "Hash" : "6E8A32A45BE0EC51E325A5F3A8E7B5B9A4B3A766F2CB2DF732746ABDBDFF03F0", "RandomIDCount" : 1790, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-21 09:49:20 +0200" }, { "Hash" : "3CC13D8E735EEF8FB37845F0C212FA9472300342E02370AD8B21FB7200F0F0A2", "RandomIDCount" : 2785, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-21 09:49:20 +0200" }, { "Hash" : "43BD6D975C57DAF38EA570975C3E0D6DBE7D9F750EA3243AF84AA552031A2D81", "RandomIDCount" : 3749, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-21 09:49:20 +0200" }, { "Hash" : "8F95F9299978F59E938CF8A3EB8CE8DF76518835A45EE6E43250F9C20E866BDD", "RandomIDCount" : 3970, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-21 09:49:20 +0200" }, { "Hash" : "332C6AB2A071450AA9ECA5D2D633FF5DFAF8D216DC16191BEECB009E5508039B", "RandomIDCount" : 4740, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-21 09:49:20 +0200" }, { "Hash" : "26C8E16D66F0FC1679BCF9A97183337AFD854CD72BF4938EC43B2DF4CEAEE5F2", "RandomIDCount" : 1655, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-22 13:10:09 +0200" }, { "Hash" : "F7249967A905848A41AA56C4B99BEFC5A4763F88635FFA89C97256752187FE8C", "RandomIDCount" : 565, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-22 13:10:09 +0200" }, { "Hash" : "254AAD2606244A9B0EE948D7F529CEF82EB0D79D7C4676BD032D72D47790B5C4", "RandomIDCount" : 2380, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-22 13:10:09 +0200" }, { "Hash" : "A18E806F1CEFF5943A93A1AD4057286209E59B7B30CD627DBF695D5DE5EA5BC2", "RandomIDCount" : 2285, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-22 13:10:09 +0200" }, { "Hash" : "3BD10320781C1E71D844AD787C7B5F3BF34FC9AC19EE4DDB85ABF6736B2CFBEB", "RandomIDCount" : 3800, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-22 13:10:09 +0200" }, { "Hash" : "9834E005A724EC22DE70E2CC43E3A2D4A9B8EEEFBE5819DB8106DBC282E31747", "RandomIDCount" : 3940, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-22 13:10:09 +0200" }, { "Hash" : "C2ABBD2EDFE0B6142B276772DC7827970BDA7D1C5DB0A29BB3B9324168CAFDA2", "RandomIDCount" : 3020, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-22 13:10:09 +0200" }, { "Hash" : "181702660F5033305B36E34F014322D1D76EC86CF378EAF1F6E36AADD8892D89", "RandomIDCount" : 2675, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-22 13:10:09 +0200" }, { "Hash" : "6E8A32A45BE0EC51E325A5F3A8E7B5B9A4B3A766F2CB2DF732746ABDBDFF03F0", "RandomIDCount" : 1790, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-22 13:10:09 +0200" }, { "Hash" : "3CC13D8E735EEF8FB37845F0C212FA9472300342E02370AD8B21FB7200F0F0A2", "RandomIDCount" : 2785, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-22 13:10:09 +0200" }, { "Hash" : "43BD6D975C57DAF38EA570975C3E0D6DBE7D9F750EA3243AF84AA552031A2D81", "RandomIDCount" : 3749, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-22 13:10:09 +0200" }, { "Hash" : "8F95F9299978F59E938CF8A3EB8CE8DF76518835A45EE6E43250F9C20E866BDD", "RandomIDCount" : 3970, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-22 13:10:09 +0200" }, { "Hash" : "332C6AB2A071450AA9ECA5D2D633FF5DFAF8D216DC16191BEECB009E5508039B", "RandomIDCount" : 4740, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-22 13:10:09 +0200" }, { "Hash" : "0E7D88851C86B53F9054AEE9A978A88D58439E638CD86D7B34BC3D5598BB3AFC", "RandomIDCount" : 3550, "MatchCount" : 0, "DataSource" : "de.rki.coronawarnapp", "Timestamp" : "2020-08-22 13:10:09 +0200" } ], "DeviceProductType" : "iPhone11,2" }

Expected behaviour

Every key package should be visible not more than once in the exposure check log.

Technical details

  • iOS Version: 18A5351d
  • Device: iPhone XS

Possible Fix

Only download the key packages that are not present on the device yet.

bug
Source
picture kamil98

All 8 comments

As of my understanding, the Names of the Hashes never changes, but the data inside does.
@thomasaugsten correct me if I'm wrong

Ein-Tim picture Ein-Tim on 22 Aug 2020

See also closed issue #778

Ein-Tim picture Ein-Tim on 22 Aug 2020

And the FAQ does also give an answer to this

Ein-Tim picture Ein-Tim on 22 Aug 2020

And the FAQ does also give an answer to this

You can further click on the details of each check to see that different amounts of keys were provided for each of them.

In my example the RandomIDCount for D34545397E3CCEAA63241BE346D55D83AB3F5C8B841464A7701138B3E033B756 is always 3050. The FAQ refers to the fact that multiple key packages are downloaded at the same time, so people are not freaked out that the exposure check log looks like this:
IMG_B7C593FD669A-1

kamil98 picture kamil98 on 22 Aug 2020

Oh yeah, I see.
Sorry for the mistake 馃檪
The RandomIDCount is everyday the same, this is also, expected behaviour (as of my understanding).
But to be sure, we will wait for the devs (@SebastianWolf-SAP)

Ein-Tim picture Ein-Tim on 22 Aug 2020

@inf2381 stated in #778:

Every 24 hours, the app feeds all available day packages from the last 14 days into the Exposure Notification framework because we need to calculate the overall risk from all keys that have been submitted within the relevant timeframe.

This could also be an answer to this

Ein-Tim picture Ein-Tim on 22 Aug 2020

Yep, inf's answer sums up the whole procedure. And for the hash: this only changes if the file content would change. So everything going as plannend, the same hash would appear 14 times in the log until that day package is no longer relevant.

The reason is that you always want to get all risk encounters from the 14 day period with the proper risk score. Days passed since exposure also contributes to that risk score (albeit currently with the same score for all values - https://github.com/corona-warn-app/cwa-documentation/blob/master/cwa-risk-assessment.md)

tkowark picture tkowark on 22 Aug 2020
👍1

So I think this is _solved_.
@kamil98 Could you close it if you're happy with the answer?
Thanks and a nice Saturday evening everyone!

Ein-Tim picture Ein-Tim on 22 Aug 2020
👍1
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