[Question 3] ISC 2017 Computer Practical Paper Solved – Caesar Cipher.
Question 3: Caesar Cipher is an encryption technique which is implemented as ROT13 (‘rotate by 13 places’). It is a simple letter substitution cipher that replaces a letter with the letter 13 places after it in the alphabets, with the other characters remaining unchanged. Write a program to accept a plain text of length L, where L must be greater than 3 and less than 100. Encrypt the text if valid as per the Caesar Cipher. Test your program with the sample data and some random data: Example 1 INPUT : Hello! How are you? OUTPUT : The cipher text is: Uryyb? Ubj ner lbh? Example 2 INPUT : Encryption helps to secure data. OUTPUT : The cipher text is: Rapelcgvba urycf gb frpher qngn. Example 3 INPUT : You OUTPUT : INVALID LENGTH SOURCE CODE import java.io.*; import java.util.*; public class ISC2017_CaesarCipher { public static void main(String args[]) { ...
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