I understand what you mean. You rather encrypt your messages yourself using the recipient's public key. So you can be totally sure that they really are encrypted. But therefore you need communication partners who take part in your concept. It's better to have things done on one's own. I agree......but...what about practicability? How many of your friends / communication partners have created key pairs and have shared their own public key with you so you can really communicate the way you have posted? How many percent of emails you have to send are really encrypted that way...I think about 'common' recipients / senders (no friends) who simply do not use key pairs on their own... I don't know what you mean. People can never know about all the details (too complex). At the moment you use them anyway you have a sort of trust in it. (Also when you purchase a product / consult a service) So you never use things with a certain assumption that they work conform to your idea?