In this AAU Micro we will dive into the captivating realm of cryptography and cryptographic signatures. Uncover the art of safeguarding information through mathematical techniques. Explore symmetric and asymmetric cryptosystems, understanding their distinct key mechanisms. Discover the power of cryptographic signatures, mastering their role in verifying message authenticity and integrity. With hands-on exercises and comprehensive lectures, this course equips you with the skills to ensure secure digital communication.