How to Code a Substitution Cipher in C. Posted: June 16, 2025 | Last updated: June 16, 2025. Learn how to build a multivariate linear regression model step by step—no libraries, just pure C++ logic!

The intriguing world of cryptography has its roots in non-standard hieroglyphics, which were discovered on the walls of an Egyptian tomb in 1900 BC. In India, around 400 BC, “substitution cipher ...