A simple way to achieve a Secure Key Exchange over a network connection by email or instant message, based on the Diffie-Hellman key exchange procedure, which 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. This key can then be used to encrypt subsequent communications using a symmetric key cipher.
How does the key exchange work?
Both parties must download and run MAXA-Key-Exchanger on each of their computers. MKE randomly generates special numbers which need to be exchanged. Simply copy the block of text and numbers and paste it into an email or instant message. Yes, we know, email is as insecure as it comes, but it is important to understand that this data exchange does not need to be kept confidential.
Each person runs the application on their respective machine and sends the data in the first box to the other person.
Once each box is filled, simply press Calculate and your passphrase is now completed
Read The publisher description in: German