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4 changes: 3 additions & 1 deletion AGGREGATE.md
Original file line number Diff line number Diff line change
Expand Up @@ -308,7 +308,7 @@ shared.
The encryption will use public keys specified by the aggregation service. The
browser will encrypt payloads just before the report is sent by fetching the
public key endpoint (the aggregation service coordinator origin at the path
`/.well-known/aggregation-service/public-keys`) with an un-credentialed request. The processing origin will
`/.well-known/aggregation-service/v1/public-keys`) with an un-credentialed request. The processing origin will
respond with a set of keys which will be stored according to standard HTTP
caching rules, i.e. using Cache-Control headers to dictate how long to store the
keys for (e.g. following the [freshness
Expand All @@ -329,6 +329,8 @@ encoded public keys is as follows:
}
```

Note: The version in the `.well-known` path may change.

To limit the impact of a single compromised key, multiple keys (up to a small
limit) can be provided. The browser should independently pick a key uniformly at
random for each payload it encrypts to avoid associating different reports.
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2 changes: 1 addition & 1 deletion index.bs
Original file line number Diff line number Diff line change
Expand Up @@ -3272,7 +3272,7 @@ To <dfn>obtain the public key for encryption</dfn> given an [=aggregation coordi
1. Set |url|'s [=url/scheme=] to |aggregationCoordinator|'s [=origin/scheme=].
1. Set |url|'s [=url/host=] to |aggregationCoordinator|'s [=origin/host=].
1. Set |url|'s [=url/port=] to |aggregationCoordinator|'s [=origin/port=].
1. Set |url|'s [=url/path=] to «"`.well-known`", "`aggregation-service`", "`public-keys`"».
1. Set |url|'s [=url/path=] to «"`.well-known`", "`aggregation-service`", "`v1`", "`public-keys`"».
1. Return a user-agent-determined public key from |url| or an error in the event that the user
agent failed to obtain the public key from |url|. This step may be asynchronous.

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