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Each of the keys encrypts one single character. This technique uses multiple character keys. In this rather than replacing one alphabet, block of alphabet is replaced. For example, a can be replaced with D and E. This is the best substitution technique with maximum security. In this technique, one plain text alphabet can map to more than one cipher text alphabet. For example, a can be replaced with B-Z, B can be replaced with A, C-Z. Therefore it makes harder for cryptanalyst to crack it. In Mono Alphabetic Cipher, There is no relation between Substitution of characters. Major disadvantage of caesar cipher is that all elements are substituted with same technique, it make easy for cryptanalyst to crack it.
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For example, a replaced with D, B replaced with E. In this all characters of plain text is replaced by other characters with same pattern. In a more straightforward way, the characters of plaintext are replaced, and other substitute characters, numbers and symbols are used at their place. Substitution technique involves the replacement of the letters by other letters and symbols. There are two primary ways in which a plain text can be modified to obtain cipher text: Substitution Technique and Transposition Technique. Difference between Synchronous and Asynchronous Transmission.nslookup command in Linux with Examples.How to Check Incognito History and Delete it in Google Chrome?.Implementation of Diffie-Hellman Algorithm.Transmission Modes in Computer Networks (Simplex, Half-Duplex and Full-Duplex).Types of area networks - LAN, MAN and WAN.Network Devices (Hub, Repeater, Bridge, Switch, Router, Gateways and Brouter).ISRO CS Syllabus for Scientist/Engineer Exam.ISRO CS Original Papers and Official Keys.GATE CS Original Papers and Official Keys.
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