Java Application – CaesarCipher
In cryptography, a cipher (or cypher) is an algorithm for performing encryption or decryption. There are many algorithms that have been invented.
A Caesar Cipher is a very simple technique. The algorithm is named after Julius Caesar who used it in some of his correspondence.
The algorithm transforms normal text by shifting each letter a certain number of characters either to the left or the right. The shift direction and count is known as the key.
Example 1: Key is -3 (shift left 3)
Example 2: Key is +3 (shift right 3)
Here is a URL for a site that allows you to test the algorithm
Notice that the case of the original text is maintained and that non-letters are not encrypted.
Create a java application to prompt the user for a key and a phrase. After the information is entered, encrypt the phrase using the provided key.
Validate the key. The absolute value of the key cannot be less than 1 or greater than 25. Prompt the user in a loop until a valid key is entered.
Put the code in a loop to continue prompting for more keys and phrases to encrypt.
Here is an example of how the program might appear
Name the Java Class: CaesarCipher
• Correct File Name (CaesarCipher.java) – case sensitive
• Correct Class Name (CaesarCipher) – case sensitive
• Correct Style – comments
• Correct Style – indentation
• Correct Style – White Space
• Free of syntax errors
• Scanner object to read from keyboard
• Program loop to continue
• Prompt for and validate the key
• Validate the key in a loop
• Prompt for and read a phrase
• Correctly encrypt the phrase
• Display the encrypted phrase
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