Public key cryptography and security certificates

Public key cryptography offers ultimate security being based asymmetric keys and is the backbone for popular protocols like security sockets layer (SSL) to be able to communicate securely between web-servers and browsers. However a whole ecosystem is based on passing or exchanging security certificates. (read more)

It is an interesting articles to anyone whom wishes to learn about PK Crypto. It might not be sufficient but it is a good start entry point.