In encryption, complexity can give us a false sense of security. In the previous example, I mentioned the possibility of patterns emerging from the technique, but I’m sure when you looked at the encrypted text, those patterns were not at all obvious, so perhaps you didn’t feel like there was anything to be concerned about.
The effort required to crack those patterns looks like the realm of savant mathematicians and quantum computing geniuses. And didn’t you read somewhere that your clever 8-digit Pa$$W0Rd would take like 1000 years to crack??
I feel it’s important to help give an accurate sense of how flimsy security can be that perhaps at first glance looked secure. Oftentimes we hear about the massive computing resources needed to churn through billions of possible password combinations and that makes us feel secure, however we mustn’t forget the enormous role that the “human element” contributes towards reducing security.