Worked on enhancing the cryptographic core of the Matziaz/TE2002B repository by implementing and refining AES encryption and decryption features using VHDL. Developed the AddRoundKey operation, integrating it into both Encryptor and Decryptor modules with control and finish signaling, and refactored code for consistent inverse operation naming. Added the InvMixColumns transformation for decryption, including Galois Field multiplications and per-byte state handling to align with AES standards. Focused on codebase maintainability and stability through targeted refactoring and naming consistency. Leveraged skills in AES cryptography, digital design, and hardware description languages to improve security and reliability of the crypto module.