[FoRK] Crypto protocol for only good news?

Sat N < sateesh.narahari at gmail.com > on > Tue Aug 15 17:34:53 PDT 2006

This is how it is achieved in India. Its illegal to tell the sex of
the baby before the birth, so some Drs only tell if its a boy ( Boy is
considered more desirable due to his earning potential thru Dowry and
other such stuff  - I know its sad, but its the reality ).

So, the couple would know if its a boy because Dr would tell them, if
its a girl or a Dr who is afraid of the laws, the couple wouldn't know
the sex of the baby.

On 8/15/06, Matt Jensen <mattj at newsblip.com> wrote:
> I'm looking for a technique for revealing info, but only if the info
> has one particular value.
> For example: Suppose a couple is pregnant with their second child. The
> first kid is a girl, and though the couple will love the second kid
> regardless of gender, they'd be extra excited if it turned out to be a
> boy.  (Plus, they could start outfitting the nursery.)
> So, we now want to know if there's some procedure whereby they can
> have the sonographer tell them if it's a boy, but not tell them
> anything if it's a girl.  Obviously, not telling them anything tells
> them it's a girl.  Anyway around this?
> Ideally, you'd like a 100% chance of learning that it's a boy.
> However, in order trust an answer like "I can't tell you the result
> because our protocol forbids it", it seems you have to accept a lower
> chance of getting the good news.
> I suppose you could have the sonographer secretly flip a coin, and if
> it's heads, she tells the parents the gender.  But if it's a girl you
> actually have the sonographer lie to you, and tell you she got tails,
> so she can't tell you the gender.  But even that tells you something:
> there are two "tails" outcomes for  a girl and only one "tails"
> outcome for a boy.
> I feel like there's a better answer to this question, but I'm missing
> it.  Ideas?
> -Matt Jensen
>   http://mattjensen.com
>   Seattle
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