This work focuses on the creation of barcodes and QR-Codes. It describes and explains the different data encodings and algorithms which make such technologies possible. Following the introduction, the second part is about Code-39 and EAN barcodes, and the third about QR-Codes. Then, the fourth chapter presents in more details some methods for error detection and correction. The final section introduces a new custom type of code named Lycacode which relies upon some aspects seen in the previous three chapters. Additionally, many parts are implemented in Python like the generation of QR-Codes and barcodes for example. These can either be found in the appendices or in the associated \hreffn{https://github.com/LordBaryhobal/5D\_Heredero\_Louis\_TM2022/tree/main/python}{GitHub repository}.