Task: Text Simplification
Input (English): diffie-hellman key exchange -lrb- d-h -rrb- is a cryptographic protocol that allows two parties that have no prior knowledge of each other to jointly establish a shared secret key over an insecure communications channel.
Output (English): diffie-hellman key exchange -lrb- d-h -rrb- is a crytographic protocol that lets two parties that do not already know each other to create a shared secret key together over an insecure communications channel.