These are a set of notes to accompany the course ``Introduction to Cryptology'' at Oklahoma State University. The course is intended as a very basic introduction to the subject of secure communications, and the primary text is
Cryptology: an introduction to the art and science of enciphering, encrypting, concealing, hiding and safeguarding, described without any arcane skullduggery but not without cunning waggery for the delectation and instruction of the general publicby A. Beutelspacher [Beutelspacher, 1994]. Therefore, our notes shall be rather sparse. Mostly, we will discuss additional topics and perhaps a little more number theory than is covered in the textbook.