This article is not about using existing cryptography methods in Raku, but presents a home made algorithm by yours truly.
To quote Loup Vaillant: «Rolling Your Own Crypto: The standard advice is "don't". You think you know what you're doing? You don't. You think your crypto is secure? It's broken. Just give up. You are not smart enough, you are not wise enough. Those who invented secure crypto just aren't human.»
I'll have a go at it anyway. Sit back, and enjoy the show as I shoot myself in the foot. Or the feet.
And a fifth part, added 26. May 2019:
•  Part 5: Real Text
The programs presented in part 2, 3 & 4 must be run from the current directory, as they rely on the module directory «lib» being there.
Do not use any of these programs (or algorithms) to encrypt important information.
The programs shown is this article are modified as we go along. The version present in the zip file is the final one.