Mozilla has built Have I Been Pwned integration into its Firefox Monitor tool, which will begin as an invitation-only service. "But when we're talking about email addresses, there's no such indicator, certainly the number of breaches each has been exposed in divulges nothing in terms of which one is likely being searched for." Have I Been Pwned integration More importantly though, email addresses are far less predictable than passwords as I mentioned earlier, if I was to spy on searches for Pwned Passwords, the prevalence of passwords in the system beginning with that hash can indicate the likelihood of what was searched by," Hunt wrote.
"This number will grow significantly over time more data breaches means more new email addresses means larger results in the range search. With email addresses, Hunt searches on the first six characters of the hash against the database of over 3 billion email addresses, but he added that this shouldn't result in less secure searches. When searching for passwords, Have I Been Pwned matches the first five characters of a SHA-1 hash, which returns, on average, 477 results per search range in a data set of 500 million records, in order to avoid exposing too much information about the password being queried - the results could include the password being queried, or not, but an attacker would not be able to determine the password being queried on the basis of the results returned. Hunt said this privacy feature will work in a similar way to the k-anonymity model used by Have I Been Pwned when searching for passwords. This is a key feature featured in both Mozilla's new Firefox Monitor and 1Password Watchtower: using Have I Been Pwned integration to allow users to search without disclosing email addresses. "They've also been instrumental in helping define the model which HIBP uses to feed them data without Mozilla disclosing the email addresses being searched for." "I'm really happy to see Firefox integrating with HIBP in this fashion, not just to get it in front of as many people as possible, but because I have a great deal of respect for their contributions to the technology community," Hunt wrote in a blog post. Troy Hunt, the security expert who created and runs the project, announced the new Have I Been Pwned integration and noted the partnership with Firefox will "significantly expand the audience that can be reached."
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