Michele Fabbrini, 2022-05-22, This memo aims to introduce the principle of "article-alien cryptography", presenting a symmetric encryption algorithm which, in our feeling, can be thought of the initial ever designed to confront the problems posed by make contact with with an alien civilization. Michele Fabbrini, 2022-05-21, In this paper we explain a symmetric vital algorithm that features an unparalleled quality of confidentiality.