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A comment on Facebook Is Giving Advertisers Access To Your Shadow Contact Information. Parent comment
A 10-digit number is only 10 billion possibilities, much less if you consider that they aren't completely random and have area codes, etc.
You can probably brute-force a hash of a phone number in seconds to minutes _on a CPU_.
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A 10-digit number is only 10 billion possibilities, much less if you consider that they aren't completely random and have area codes, etc.
You can probably brute-force a hash of a phone number in seconds to minutes _on a CPU_.