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!

In India, around 400 BC, “substitution cipher” codes were evident in the “Kama Sutra,” which were communications between lovers. ... using a defined algorithm, which is a cypher.