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Email addresses are one of our most public piece of PII. We
are confortable sharing it with strangers, publishing it on the
internet and it is generally our public way of communicating.
However, when it comes to phone numbers things change. We are more
selective with who we share it with, mostly because receiving
unsolicited phone calls is much more invasive. There are also security
implications when making your phone number publicly available. SS7
attacks, SIM swapping, phishing and scam calls are just a few of the
threats that originate from the target’s phone number.
What if it were possible to obtain someone’s phone number by only
knowing their email address? Beyond the criminal advantage, it could
be very useful to investigators, red teams and OSINT lovers.
In this talk, I will discuss techniques which when combined will let
you discover someone’s phone number via their email address. I will
also demo and release a tool that helps automate the process.