This isn’t going to be a long post (I know a lot of mine have been too long, lately) but that doesn’t make it any less important. It’s short because the concept is simple. Unfortunately, many are missing out on this easy technique.
The idea of the NoFollow attribute on links was to help prevent spam from appearing on user generated content sites, particularly Wikipedia. It was intended as a way to tell Google (and eventually all major search engines) that a link was not supposed to transfer any “link juice” to the recipient of the link. In essence, it was designed to stop SEO spammers from trying to insert their links where they didn’t belong for the sake of improved rankings.
When most think of encryption, they think of computers using complex algorithms to hide data in ways that require a password or key. This is a very modern and simplistic view of a long and stories history behind encryption. Since the dawn of human communication we’ve had a need to be able to send messages without the risk of them being seen by the wrong people. Thus, encryption is as old as the written word in some cultures.