The title of the article mentions the word "cryptology," yet the article discusses "cryptography." Similar yet distinctly different words.
I got confused, so I did some quick web searching. For those who desire further illucidation, this is what I found:
The science of cryptology is the science of secure communications.
The study of how to circumvent the use of cryptography is called cryptanalysis, or codebreaking. Cryptography and cryptanalysis are sometimes grouped together under the umbrella term cryptology, encompassing the entire subject.