CRYPTOGRAPHY DEFINITION Cryptography is the science of writing

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CRYPTOGRAPHY

CRYPTOGRAPHY

DEFINITION • Cryptography is the science of writing in secret code • The earliest

DEFINITION • Cryptography is the science of writing in secret code • The earliest documented use began around 2, 000 B. C in Egypt (Hieroglyphics) • Encryption has been used during warfare. Most recently it has been applied to cyber-security. From “An Overview of Cryptography” by Gary C. Kessler, 28 July 2014, http: //www. garykessler. net/library/crypto. html

HISTORY • 1835 -- Samuel Morse invented the Morse Code • 1843 -- Construction

HISTORY • 1835 -- Samuel Morse invented the Morse Code • 1843 -- Construction of experimental telegraph line from Washington to Baltimore (40 miles) • http: //www. youtube. com/watch? v=b. No. OYe. S 0 gs 0

HISTORY • 1895 – Changed Cryptology— • Communications were open for anyone’s inspection

HISTORY • 1895 – Changed Cryptology— • Communications were open for anyone’s inspection

TYPES From “An Overview of Cryptography” by Gary C. Kessler, 28 July 2014, http:

TYPES From “An Overview of Cryptography” by Gary C. Kessler, 28 July 2014, http: //www. garykessler. net/library/crypto. html

THE POLYBIUS SQUARE 1 2 3 4 5 1 A B C D E

THE POLYBIUS SQUARE 1 2 3 4 5 1 A B C D E 2 F G H I J 3 K L M N O 4 P Q R S T 5 U V W X Y/Z Ciphertext: 45232444 11 441513431545 32154444112215 Go to http: //www. braingle. com/brainteasers/codes/polybius. php for other types of ciphers

THE ENIGMA MACHINE • The machine was like a typewriter, with the rotor replaced.

THE ENIGMA MACHINE • The machine was like a typewriter, with the rotor replaced. • It combined substitution and rotation ciphers such that the code was difficult to break. • The machine could decode as well as encoding messages.

ACTIVITIES http: //www. austincc. edu/lrosen/1314/webact 2. htm http: //illuminations. nctm. org/Lesson. aspx? id=1926 http:

ACTIVITIES http: //www. austincc. edu/lrosen/1314/webact 2. htm http: //illuminations. nctm. org/Lesson. aspx? id=1926 http: //jwilson. coe. uga. edu/EMAT 6680 Fa 09/Kim. S/EMAT 6690/3 rd%20 Write%20 up/Project. Code/Project. Coding. html http: //www. sosmath. com/matrix/coding. html

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