You want to send a secret message to your friend Alex in the mail.
But Sam, who you don't trust, has access to all your mail.
So you put your message in a box with a lock.
But you are not allowed to send a key!
How can you get your message through securely?
Click here for answer...
But Sam, who you don't trust, has access to all your mail.
So you put your message in a box with a lock.
But you are not allowed to send a key!
How can you get your message through securely?
Click here for answer...
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