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Week 4 Lecture Notes

# Week 4 Lecture Notes - January 28 Lecture 10 Announcements...

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January 28: Lecture 10 Announcements Finish reading Chapter 2 if you have not done so yet Begin reading Chapter 6 *Big keywords reduce multiple occurrences of certain group of letters grouped together. One-time Pad Ciphers : hard to do because you need to travel to the other person and give them the key before-hand so they can read the ciphertext Book Cipher : encode a secret message where the letter encoded is the first letter of each word and the words are numbered from 1 on in like a newspaper or book and the ciphertext is just the numbers that represent the word that has that specific number in the article; each letter could also be numbered in the text instead of each word EX : 110, 73, 24, 807, 65, 86 (word in the article) A, R, E, Y, O, U (first letter of that wrd) Computers Binary #’s 0’s and 1’s (~“bits”) Base 10 : we make numbers using only 10 symbols: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 Base 2 : what computers use: 0, 1 ~ 0, 1, 10, 11, 100, 101… Base 10 : 734 7 x 10 2 , 3 x 10 1 , 4 x 10 0 = 700 + 30 + 4 = 734 Base 2 : 110 1 x 2 2 , 1 x 2 1 , 1 x 2 0 = 4 + 2 + 0 =

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