It looks like it uses bloom filters for the phone number: isCntactRegisteredWith... | Hacker News

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		acdha on July 29, 2014 \| parent \| context \| favorite \| on: Free, Worldwide, Encrypted Phone Calls for iPhone It looks like it uses bloom filters for the phone number: isCntactRegisteredWithWhisper calls isPhoneNumberRegisteredWithWhisper: https://github.com/WhisperSystems/Signal-iOS/blob/19ff47e278... The implementation is simply checking a bloom filter: https://github.com/WhisperSystems/Signal-iOS/blob/19ff47e278... … and the filter is periodically downloaded from their servers: https://github.com/WhisperSystems/Signal-iOS/blob/19ff47e278... https://github.com/WhisperSystems/Signal-iOS/blob/19ff47e278... which ultimately ends up at: https://master.whispersystems.org:31337/users/directory

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