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The answer is “Yes” you can learn Cryptography from these videos, but honestly you are going to need a real degree to do the real stuff. You can find out that number theory and probability theory are used. Their video says, “a lock is only as strong as its weakest point” and suggests that conceptually codes may be reduced to fingerprints. I learned its called Frequency Analysis when you count repetitions, presumably with the purpose of breaking a code. It helps if you have some practice. I have some through my classes and standardized tests. There is believe it or not some code braking on tests like The SAT and the SHSAT. On The SAT it was an advanced problem. I used the following technique to solve the SAT problem: serially shift and algebraically move, decode from a latin alphabet to a numerical one. This is problem 16 page 418 from ISBN-13: 978-0-87447-852-5, The College Board’s The Official SAT Study Guide: A four-digit integer, WXYZ, in which... read more

My great-uncle Hans was the executive officer (1 Wachoffizier) of the German submarine U-618 during WWII. While on patrol, the sub's activities were recorded in the log (Kriegstagebuch, or war diary). After the war, captured German naval records were microfilmed and archived by the British Admiralty, and copies are stored in the National Archives. Another u-boat researcher, Jerry Mason, was kind enough to send me digital copies of U-618's war diaries, and so I have begun to translate them.    Aside from the family connection, this project is motivated by my interests in WWII naval history and the role that intelligence and cryptography play on the battlefield. Clay Blair's books on the subject are worth a read ("Hitler's U-Boat War: The Hunters", "Hitler's U-Boat War: The Hunted", "Silent Victory"); for a great fictionalized account of cryptography's role in war, see Neal Stephenson's "Cryptonomicon".   I've... read more

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