[messaging] Masking contact addresses with ECDH

[Ben Harris]

On 1 Mar 2016 7:00 am, "Tony Arcieri" <bascule at gmail.com> wrote:
>
>
> For each contact, Alice picks a large random scalar, and multiplies the
contact by that scalar, and publishes both the scalar and the resulting
curve point in the directory.
>

What if I were to take the scalar and raise it to [the field prime minus 2]
mod the prime?
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