An Experience of Abcd-Problems Based Brief Cryptography Introduction

Cryptography due to corresponding non-visual counter-intuitive mathematics is not a very suitable theme for basic general introductory applied mathematics courses for non-specialists. Still, according to the author's own experience of many thousand students teaching, there is a possible oversimplification of several basic first-generation asymmetric cryptography algorithms to (computerless) manual calculations level, that can be given in the middle of such an introductory course, providing a general understanding of fundamental technic, that may be an earliest career orientation step for some pupils (students) and an important brick of general education for all others.