Obfuscation

Under obfuscation is understood in computer science means the deletion of information, so that the actual content is not obvious at first glance.

An obfuscator is a tool for concealment of certain information contained in computer programs. An obfuscator is to complicate the re-conversion of a program, which exists as a finished product, in a readable for a human form.

Also, the ROT13 encryption is because of their simplicity rather than obscuring a real encryption.