This document provides an overview of wireless LAN security fundamentals, including cryptography, certificates, and 802.1X authentication. It begins with a cryptography primer covering symmetric and asymmetric encryption, hash functions, digital signatures, and key concepts. It then explains public key infrastructure (PKI) and the role of certificates in establishing trust between parties. The document concludes by describing how 802.1X authentication utilizes Extensible Authentication Protocol (EAP) and PKI to authenticate users before granting them network access.