ITIS 1210 Introduction to Web-Based Information Systems Chapter 11 How Email Works

How Email Works Same technology as rest of the Internet TCP breaks message into packets IP delivers packets to correct address TCP reassembles Mailing lists send same message to multiple parties Moderated lists are screened

How Email Works Can subscribe to mailing lists Directories are common List server or listserv manager Directories are common White pages Yellow pages Email is not secure Can be read by snoopers Encryption necessary to ensure privacy

Simple Encryption Letter ASCII Quotient Remain Send H 72 6 60 E 69 5 9 60 E 69 5 9 59 L 76 4 64 O 79 7 67 Key = 12

Simple Encryption Received Quotient Remain ASCII Letter 60 6 78 N 59 5 78 N 59 5 9 74 J 64 4 82 R 67 7 85 U Key = 13