A page of links to various cryptography web pages. Visit the RSA Home page . The ACM's Cryptography home page. A number of links. Please let me know if you find more.
Cryptographic techniques are of obvious value to the military.
They can also be of value to criminals. I am not a lawyer, and I cannot speak authoritatively on this subject, but let me share the little I have learned by way of an example. Please consult a lawyer if you plan to create software programs based on the methods you have learned in this course.