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Cryptography November 14, 2011 1 Intercepting Information Scenario - PowerPoint PPT Presentation

Oct 23, 2023 •111 likes •182 views

Cryptography November 14, 2011 1 Intercepting Information Scenario 1 Wireless broadcasts information using radio signals Any computer on a wireless network CAN listen to any network traffic A computer SHOULD only listen to traffic

  1. Cryptography November 14, 2011 1 Intercepting Information Scenario 1 Wireless broadcasts information using radio signals Any computer on a wireless network CAN listen to any network traffic A computer SHOULD only listen to traffic addressed to it http:/ /www.geeksquad.com/ uploadedImages/ It is impossible to know if wwwgeeksquadcom/Tools/ anyone is eavesdropping Tech_Articles/ going_wireless_1.jpg 2 Monday, November 14, 2011

  2. Intercepting Information Scenario 2 Mail Spam filter reads Internet a mail message server to decide if it is spam What could an unscrupulous person do when Your he/she writes a laptop spam filter? 3 Cryptography 4 Monday, November 14, 2011

  3. Caesar Cipher Example Key = 3 Plaintext: Mount Holyoke PLAINTEXT LETTER M N O P Q R S T U V W X Y CIPHERTEXT LETTER P Q R S T U V W X Y Z A B Ciphertext: 5 Caesar Cipher Example Key = 3 Plaintext: Mount Holyoke PLAINTEXT LETTER M N O P Q R S T U V W X Y CIPHERTEXT LETTER P Q R S T U V W X Y Z A B Ciphertext: P 6 Monday, November 14, 2011

  4. Caesar Cipher Example Key = 3 Plaintext: Mount Holyoke PLAINTEXT LETTER M N O P Q R S T U V W X Y CIPHERTEXT LETTER P Q R S T U V W X Y Z A B Ciphertext: PR 7 Caesar Cipher Example Key = 3 Plaintext: Mount Holyoke PLAINTEXT LETTER M N O P Q R S T U V W X Y CIPHERTEXT LETTER P Q R S T U V W X Y Z A B Ciphertext: PRX 8 Monday, November 14, 2011

  5. Caesar Cipher Example Key = 3 Plaintext: Mount Holyoke PLAINTEXT LETTER M N O P Q R S T U V W X Y CIPHERTEXT LETTER P Q R S T U V W X Y Z A B Ciphertext: PRXQ 9 Caesar Cipher Example Key = 3 Plaintext: Mount Holyoke PLAINTEXT LETTER M N O P Q R S T U V W X Y CIPHERTEXT LETTER P Q R S T U V W X Y Z A B Ciphertext: PRXQW 10 Monday, November 14, 2011

  6. Caesar Cipher Example Key = 3 Plaintext: Mount Holyoke PLAINTEXT LETTER M N O P Q R S T U V W X Y CIPHERTEXT LETTER P Q R S T U V W X Y Z A B Ciphertext: PRXQW KROBRNH 11 General Letter Substitution Algorithm: Substitute 1 letter for another Key PLAINTEXT LETTER A B C D E F G H I J K L M CIPHERTEXT LETTER G J A O U N E Z Y P H S T PLAINTEXT LETTER N O P Q R S T U V W X Y Z CIPHERTEXT LETTER V W L M I B D C R K F Q X Ciphertext: LUGAU 12 Monday, November 14, 2011

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