Question: Caesar Cipher In Java - CicularArrayQueue.java (I Have Implemented All The Methods Execpt The Constructor) Package Lab08; Import Sun.invoke.empty.Empty; /. @version./ Public Class CircularArrayQueue Implements QueueInterface Private T Queue; // Circular Array Of Queue Entries And One Unused Location Private Int FrontIndex; //. But this will not caesar-cipher, for that matter you can start looking by 'how to traverse in cyclic order'. Encryption and decryption in java source code. Nov 21, 2016 Caesar Cipher in Java (Encryption and Decryption) Here you will get program for caesar cipher in Java for encryption and decryption. Caesar Cipher is an encryption algorithm in which each alphabet present in plain text is replaced by alphabet some fixed number of positions down to it. Caesar Cipher in Java. GitHub Gist: instantly share code, notes, and snippets.

1. Caesar Cipher Decryption Java Code
2. Caesar Cipher Java Program
3. Caesar Cipher Java
4. Caesar Cipher Java Code

Caesar cipher technique was founded by Julius caesar. Before looking at the caesar cipher program in java with output for encryption and decryption, first, we need to understand the terms plaintext and ciphertext.
Read Also:Vigenere Cipher Program in Java
What is plaintext and ciphertext?
plaintext is the input message given by user. In other words, message that needs to be encrypted.
ciphertext is the encrypted message. In other words, message after applying the caesar cipher technique.
What is Caesar cipher?
Caesar cipher is one of the simplest encryption technique. It is also known as the shift cipher, Caesar's cipher, Caesar shift or Caesar's code. Caesar cipher is a type of substitution cipher.
By using this cipher technique we can replace each letter in the plaintext with different one a fixed number of places up or down the alphabet.
For example :
With right shift of 3:
plaintext : ABCDEFGHIJKLMNOPQRSTUVWXYZ
ciphertext : DEFGHIJKLMNOPQRSTUVWXYZABC
With left shift of 3:
plaintext : ABCDEFGHIJKLMNOPQRSTUVWXYZ
ciphertext : XYZABCDEFGHIJKLMNOPQRSTUVW
With right shift of 2:
plaintext : Java Hungry Blog
ciphertext : Lcxc Jwpita Dnqi
As you can see for the above example 'Java Hungry Blog' each character in plain text is shifted by 2 as J become L , a become c , v become x and so on.

Caesar Cipher Decryption Java Code

Note : You can use either left shift or right shift but not both in same text.
If we want to see Caesar cipher in mathematical way, then formula to get encrypted letter will be :
e = (x + n) mod 26
where,
n is the number of positions we need to shift plaintext characters
x is the place value of original letter
e is the place value of encrypted letter
On the other hand, we will use the below formula to decrypt each letter.
e = (x - n) mod 26
Pseudo Code for Caesar Cipher

1. Input : String plaintext
2. Input : An integer between 0 and 25 representing the right shift of the character or,
an integer between -25 and -1 representing the left shift of the characters.
3. Traverse each character in the plaintext one at a time
4. Transform the given character depending on encryption or decryption.
5. print the ciphertext.

Simple Caesar Cipher Program in Java for Encryption

Caesar Cipher Java Program

Output :

Caesar Cipher Java

Input the plaintext message : Java Hungry Blog
Enter the value by which each character in the plaintext message gets shifted : 2
ciphertext : Lcxc Jwpita Dnqi
Simple Caesar Cipher Program in Java for Decryption
Output :
Input the ciphertext message : Lcxc Jwpita Dnqi
Enter the shift value : 2
decrypt message : Java Hungry Blog
That's all for the post caesar cipher program in java with output. If you have any questions then please mention in the comments below.

Caesar Cipher Java Code

Image Credits : Cepheus [Public domain], from Wikimedia Commons
Matt_Crypto [Public domain], via Wikimedia Commons