Be aware that serious modern cryptography is essentially pure mathematics, and to code it yourself is both not advisable for anything other than fun and education, and remarkably tricky to do well.
You can simply download the videos and watch them. Understanding the cryptography is far harder than implementing it. If you don't have the mathematics you'll struggle, so give the first few videos a go and see what you need to learn.
The following may be of interest (all chapters are available for free download from the link). Handbook of Applied Cryptography
http://www.cacr.math.uwaterloo.ca/hac/
Also look at Applied Cryptography
by Bruce Schneier