Cryptography What is cryptography The process of writing

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Cryptography

Cryptography

What is cryptography? The process of writing or solving secret messages or codes.

What is cryptography? The process of writing or solving secret messages or codes.

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What is a cipher? An algorithm used to encrypt a message.

What is a cipher? An algorithm used to encrypt a message.

Substitution Cipher One alphabet: Monoalphabetic substitution Initial alphabet: ABCDEFGHIJKLMNOPQRSTUVWXYZ Substitution cipher: DEFGHIJKLMNOPQRSTUVWXYZABC “MOM” becomes…

Substitution Cipher One alphabet: Monoalphabetic substitution Initial alphabet: ABCDEFGHIJKLMNOPQRSTUVWXYZ Substitution cipher: DEFGHIJKLMNOPQRSTUVWXYZABC “MOM” becomes… “PRP” Multiple alphabets: Polyalphabetic substitution Initial alphabet: Substitution cipher 1: Substitution cipher 2: Substitution cipher 3: Substitution cipher 4: ABCDEFGHIJKLMNOPQRSTUVWXYZABC “JOHN” becomes… GHIJKLMNOPQRSTUVWXYZABCDEF “MUQZ” JKLMNOPQRSTUVWXYZABCDEFGHIJKL

Your turn… Initial alphabet: Substitution cipher 1: Substitution cipher 2: Substitution cipher 3: Substitution

Your turn… Initial alphabet: Substitution cipher 1: Substitution cipher 2: Substitution cipher 3: Substitution cipher 4: Ciphertext: ERDQ BLUE Plaintext: ? ? ? ABCDEFGHIJKLMNOPQRSTUVWXYZABC GHIJKLMNOPQRSTUVWXYZABCDEFGHI MNOPQRSTUVWXYZABCDEFGHIJKL

Vernam Cipher Plaintext: Plaintext value: One-time pad text: One-time pad value: Sum of plaintext

Vernam Cipher Plaintext: Plaintext value: One-time pad text: One-time pad value: Sum of plaintext & pad: After modulo subtraction: Ciphertext: S P A R E N O O N E 19 16 01 18 05 14 15 15 14 05 E H T Z L A C D G J 05 08 20 26 12 01 03 04 07 10 24 24 21 44 17 15 18 19 21 15 18 X X U R Q O R S U O

Your turn… Plaintext: M E E T A T S T A R B

Your turn… Plaintext: M E E T A T S T A R B U C K S 13 05 05 20 01 20 19 20 01 18 02 21 03 11 19 Pad text: I M W L V Q N E Y B P A F R M 09 13 23 12 22 17 14 05 25 02 16 01 06 18 13 Sum: 22 18 28 32 23 37 33 25 26 20 18 22 09 29 32 Modulo subtraction: 02 06 11 07 03 06 VRBFWKGYZTRVICF Ciphertext: ? ? ?

Book Cipher One word End of word 134, 8, 9; 23, 13, 6; 67,

Book Cipher One word End of word 134, 8, 9; 23, 13, 6; 67, 7, 7; Page Number Word Number (in line) Line Number (on page)

Your turn… 166, 18, 6; 105, 28, 3; 61, 25, 5; “Plague affected Michigan”

Your turn… 166, 18, 6; 105, 28, 3; 61, 25, 5; “Plague affected Michigan”

Encryption in everyday life From your survey results, 11% of your class uses Encryption

Encryption in everyday life From your survey results, 11% of your class uses Encryption to secure their files 89% of your class uses secure Wi-Fi 67% of your class has 11 -20 online accounts … but only 20% have 10 -20 different passwords (80% have 5 or less) 89% of your class is connects to Bluetooth

Relation to Business Human Resources Marketing Operations Finance/Accounting

Relation to Business Human Resources Marketing Operations Finance/Accounting

Questions?

Questions?

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