Cryptography

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Figure 1 shows a hierarchy of the classes. Figure 1. Inheritance hierarchy From the above analysis a partial abstract class Cipher is depicted be by Listing 1. public abstract class Cipher { private String message; public Cipher(String text) { ? } public String encrypt() { String word = encode(?); return ?...
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This class defines the methods code and decode. The method encode takes a String parameter and returns a String result. It takes each character of the parameter and performs a Caesar shift on the character. That is, the a shift with possible wrap around can be coded as follows: char ch = word...
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