discmath.pdf # (Sets and functions)
soludismath.pdf # (Sample solutions to the "Pause and Think" questions)
history1.pdf # (History of cryptography: Part I)
history2.pdf # (History of cryptography: Part II)
readdes.pdf # (The Data Encryption Standard in deatil) [Optional -- for those who want to learn more]
aesaux.pdf # (The S-box and M functions) [Optional -- for those who want to learn more]
AES.pdf # (The Advanced Encryption Standard) [Optional -- for those who want to learn more]
Radix-64.pdf # (Radix-64 conversion) [Optional -- for those who want to learn more]
IBE.pdf # (identity based encryption) [Optional -- for those who want to learn more]