Puzzles/How do you ... ?/Sending a Package/Solution

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  • Dmitri secures the package with a padlock and chain and sends it to Ana.
  • Ana attaches another padlock to the package and locks it. She then sends the package back to Dmitri.
  • Dmitri removes his padlock and sends the package back to Ana.
  • Ana removes her padlock and opens the package.


  • Dmitri sends the locked package to Ana while also sending a separate letter with the key a few days later. Or if a combination lock, Dmitri sends a letter a few days later with the code.

problem with above:

  • the unlocked letter with the key may be opened and the key stolen..