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Links 1 through 10 of 24 by Justin Mason tagged false-positives

'Virgin and NTL [in the UK] blocked [del.icio.us] for years' due to a false positive -- joshua

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'Storing 50,000 2.5KB items in a traditional hash set requires over 125MB, but if you're willing to accept a 1-in-10,000 false positive rate on lookups, [this] bloom filter requires under 500KB' - interesting variation on the basic concept.  Java, Apache-licensed

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DHS/ICE domain seizures suffer a serious false positive problem, resulting in the seizure and shutting down of 84,000 subdomains of a free DNS provider, replacing them with a banner accusing the site of trafficking in child porn. whoops!

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more good Bloom Filter tips. he says: 'I take a slightly different tack, starting with a target population in mind which determines the size of the filter. Also there's a minor error regarding performance in the corte.si post. You only need to calculate two hash functions, and use a linear combination of them to index the Bloom filter. This simplifies the coding a lot, and if hash calculation dominates filter indexing, it's also a lot faster.'

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the Canadian mag "The Beaver" is changing its name due to broken filters' false positives. Bennett Haselton reckons that there's no incentive to fix FPs, which as Henry Stern notes isn't the case

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supposedly should only list child porn sites, but sounds like it's got frequent false positives on file upload/download services nowadays

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police-run anti-child-porn blocklist accidentally lists w3.org. Oops

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'a technical problem in one of our contributory feeds resulted in a number of invalid CBL listings [...] The feed was removed from operation as soon as we became aware of the issue and have purged all the IPs.'

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'sharp uptick in the number of non-spam messages that failed to make it into inboxes. The reports coincide with a noticeable decline in the number of messages being funneled into junk mail folders'

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