Applied to on-line content the advertising model leads to similar problems like in the traditional media. Dependence on advertising revenue puts pressure on content providers to consider advertising interests. Nevertheless new difficulties caused by the technical structure of online media, missing legal regulation and not yet established ethical rules, appear.
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As within the traditional media landscape, Internet content providers have two primary means of generating revenue: Direct sales or subscriptions, and advertising. Especially as charging Internet users for access to content - with all the free material available - has proven problematic, advertising is seen as the best solution for creating revenues in the short term. Therefore intense competition has started among Internet content providers and access services to attract advertising money.
Table: Web-Sites Seeking Advertising
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Source: Adknowledge eAnalytics. Online Advertising Report
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the word "cipher" comes from the Hebrew word "saphar", meaning "to number". Ciphers are mere substitutions. Each letter of the alphabet gets substituted; maybe by one letter or two or more.
an example:
PLAINTEXT a b c d e f g h i j k l m n o p q r s t u v w x y z
CIPHERTEXT D E F G H I J K L M N O P Q R S T U V W X Y Z A B C
Device used by the German military command to encode strategic messages before and during World War II. The Enigma code was broken by a British intelligence system known as Ultra.