Okay, thinking further: The (open) (pad)locks you distribute also carry a seal impression. Then: - to encrypt, the user takes a padlock of the recipient and ad

Okay, thinking further: The (open) (pad)locks you distribute also carry a seal impression. Then: - to encrypt, the user takes a padlock of the recipient and adds it to the message. - to decrypt, the recipient uses his key to open the lock. - to sign something, you use your key as a seal, creating a unique impression on the message - to check a signature, the recipient compares the impression on the message with the impression on the lock. Does that make at least some sense?