In the early 1990’s I created and taught a class on cryptology. This content is a mixture of examples and concepts that are practical, hands-on, and fun for middle-school to adult. The first release of content from this course is for the Bifid Cipher. I’ll try to post about every day until all the examples from the class are released to increase awareness. Schools have permission to use this content freely with credits to Ken Dunham, 4D5A Security LLC. No unauthorized commercial reproduction or use of this content is allowed.