It's a simple Q: Do you or do you not send or store any information derived from the address book to a server?
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Yes, truncated hash lookups are transmitted. Never stored.
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OK! Now can these truncated hashes be inverted back into telephone numbers?
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Replying to @marshray
@thorsheim@whispersystems@letoams Of course they can.2 replies 1 retweet 5 likes -
Replying to @matthew_d_green
Thanks,
@matthew_d_green that was my point.@thorsheim@whispersystems@letoams2 replies 0 retweets 1 like -
Forgive my ignorance, arent trunc'd hashes supposed to induce collisions to make invert hard?
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the set isn't always guaranteed to be >N where N is a deep enough set of arbitrary users
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Replying to @DonAndrewBailey @marshray and
Well, yeah, but you can adjust truncation accordingly.
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in a large enough key/user space theres no sweet spot where bits are both usable & opaque
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Replying to @DonAndrewBailey @taviso and
they are either usable bits or unusable opaque bits; thus always reversible
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I don't follow. Clearly a 1bit trunc'd hash can't be inverted, but is still useful as it reduces the search space by 50%.
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