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Return an empty set #40

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Return an empty set #40

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3 changes: 2 additions & 1 deletion README.md
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Expand Up @@ -53,7 +53,8 @@ The topics will be inferred by the browser. The browser will leverage a classifi
* The array may have zero to three topics in it. As noted below, the caller only receives topics it has observed the user visit in the past.
* For each week, the user’s top 5 topics are calculated using browsing information local to the browser. One additional topic, chosen uniformly at random, is appended for a total of 6 topics associated with the user for that week/epoch.
* When `document.browsingTopics()` is called, the topic for each week is chosen from the 6 available topics as follows:
* There is a 5% chance that the random topic is returned
* In ~.5% - 1% of calls, return an empty set
* In 5% of calls, return the random topic
* Otherwise, return the real top topic whose index is HMAC(per_user_private_key, epoch_number, top_frame_registrable_domain) % 5
* Whatever topic is returned, will continue to be returned for any caller on that site for the remainder of the three weeks.
* The 5% noise is introduced to ensure that each topic has a minimum number of members (k-anonymity) as well as to provide some amount of plausible deniability.
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