We all keep secrets.
Its easy to do once youve committed to it.
Just dont say anything.
Image: Photo: Shutterstock Graphics: Vicky Leta
Computer scientists often draw this distinction between security and privacy.
Security focuses on keeping sensitive data out of the hands of untrusted parties, full stop.
This kind of partial secrecy turns out to require some delicate mathematics beyond the demands of traditional security.
Did you miss last weeks puzzle?
Check it outhere, and find its solution at the bottom of todays article.
Be careful not to read too far ahead if you havent solved last weeks yet!
Everyone is curious, but nobody feels comfortable sharing their own pay with the group.
You may assume that everybody cooperates with the chosen strategy.
Well be back next Monday with the solution.
Do you know a cool puzzle that you think should be featured here?
Cheryl gives them a list of 10 possible dates.
Bernard: At first I didnt know when Cheryls birthday is, but I know now.
Albert: Then I also know when Cheryls birthday is.
When is Cheryls birthday?
Answer: Cheryls birthday is July 16th.
Albert knows that Bernard does not know Cheryls birthday from the day alone.
Albert must have been told July or August, which dont have the 18th or 19th as options.
Next, Bernard announces he knows the birthday.
So Bernard must have been told 15, 16, or 17.
Now Albert also knows the birthday.
News from the future, delivered to your present.
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