24 standard interview puzzles - Secret mail puzzle
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You want to send a secret message to your friend by mail but another untrustworthy friend has access to your mail. You can put the message in a locked box but cannot send the key. To securely send the message, you must find a way to let your friend know the key without directly sending it through the mail.
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24 standard interview puzzles - Secret mail puzzle
- 2. Puzzle Question: You (A) want to send a secret message to u r friend (B) by mail. But u r another friend (C) who u don’t trust him, has all access to your mail. So u can put u r message in a box with a lock. Only those who know the key can open it. But u r not allowed to send the key. How can u send the message through securely?