Introduction This article is a gentle introduction to problematics of secure electronic communication. Whoever wants to communicate on the Internet in a secure manner can generally choose one of two technologies. One of them is PGP respectively the free implementation GPG. The characteristic feature of this is that the trustworthiness and security of communication are based solely on the relationship between the sending and the receiving party. However in some situations, this is not satisfactory. If you want to communicate with government entities, servers that are not under your control, people you never met in person, there is an opportunity