Caesar Cipher Algorithm

One of the problems that Julius Caesar faced while expanding the Roman Empire was communicating with his generals in a secure manner—so that someone else reading the messages would not be able to understand them but that his generals could. Caesar came up with the idea of encoding his messages by simply shifting each letter to the right in the alphabet. Caesar selected a shift amount (the Key) of 3. Thus, A becomes D, B becomes E, and so forth. Nonletters are left alone. To decode a message, the letters shift to the left by 3. So, F becomes C, G becomes D, and so on. In Caesar’s time, this kind of coding (called a substitution code) was essentially unknown. Caesar was able to communicate his battle plans securely. Note: Today this kind of encryption is far too easily broken to be used.

Implementation Notes

To implement a Caesar Cipher translation scheme in Java, you will need to acquire the Key to be used and the text string to be translated. You’ll need to access the characters in the String one-by-one. Use the String.charAt() method to do this. You’ll need to translate each letter using the Key, leaving nonletters alone. You can use the Character.isLetter() method to determine whether a given character is a letter. You’ll need to use exception handling to deal with the case of a nonnumeric Key.

The Key and the String should be on one line, as illustrated. Implement the heart of the program as a method, called “translate.” It should have the following declaration: public static String translate(String inText, int key)

Following is an example of a portion of what your program’s output might look like:

Input key <space> text: 0 AbCd

Translated: AbCd

Input key <space> text: 1 Testing, 1-2-3.

Translated: Uftujoh, 1-2-3.

Input key <space> text: -1 Uftujoh, 1-2-3.

Translated: Testing, 1-2-3.

Input key <space> text: X

Bad key. Not in -3..+3

Input key <space> text: 99

In this assignment, you will build a program that implements the Caesar Cipher algorithm. You must build a method called translate—public static String translate(String inText, int key)—that accepts the provided text and Key. It then uses the Caesar Cipher algorithm to translate inText into a String, called outText, which is what the method returns. If Key is greater than zero, then every character in inText is “shifted” to the right in the alphabet by Key characters. For example, if Key = 1, then “ABC” becomes “BCD.” If key is less than zero, then every character in inText is “shifted” to the left by Key characters. For example, if Key = –2, then “DEF” becomes “BCD.” The key value is guaranteed to be in the range –3..+3.

Translate must be a method with the header/signature shown above.

You also need to build a “driver”—it’s the main method—which does the following:

  1. It displays an appropriate title message.
  2. It repeatedly requests input: <key value=””> <input text=””>, the Key value is a (possibly signed) integer, followed by whitespace, followed by text through the end of the current line.
  3. It calls translate() to translate the text using the Key.
  4. It then displays the resulting text.
  5. It repeats steps 2–4 until a Key value > –3 or < –3 is encountered.
  6. Invalid Keys (nonnumeric) are dealt with using exception handling; the program then continues.

Complete the following steps to build a program that implements the Caesar Cipher algorithm.

  1. Build a translate method—public static String translate(String inText, int key)—that accepts the provided text and Key.
    • Translate must be a method with the header/signature shown above.
  2. Build a driver method.
  3. Take sufficient screen shots to demonstrate that your program meets all requirements.
    • Include the execution output of your program to convince a reader that it functions properly—both encoding and decoding messages.
    • Test your program with both positive and negative Key values and text strings containing both alphabetic and nonalphabetic characters.
    • Paste these screen shots into an MS Word document.
  4. For your final test, you use must use the following input: “–3 Zh, wkh 42 shrsoh, ri wkh . . .”
  5. Create a .zip file containing your NetBeans Caesar Cipher project.
    • Before zipping your project, right-click the project and “clean” it. This greatly reduces the file size and speeds up the program’s performance.
Academic Heros
Calculate your paper price
Pages (550 words)
Approximate price: -

Why Work with Us

Top Quality and Well-Researched Papers

Our writers are encouraged to read and research widely to have rich information before writing clients’ papers. Therefore, be it high school or PhD level paper, it will always be a well-researched work handled by experts.

Professional and Experienced Academic Writers

For one to become part of our team, thorough interview and vetting is undertaken to make sure their academic level and experience are beyond reproach, hence enabling us give our clients top quality work.

Free Unlimited Revisions

Once you have received your paper and feel that some issues have been missed, just request for revision and it will be done. In addition, you can present your work to the tutor and he/she asks for improvement/changes, we are always ready to assist.

Prompt Delivery and 100% Money-Back-Guarantee

All our papers are sent to the clients before the deadline to allow them time to review the work before presenting to the tutor. If for some reason we feel our writers cannot meet the deadline, we will contact you to ask for more time. If this is not possible, then the paid amount will be refunded.

Original & Confidential

Our writers have been trained to ensure work produced is free of plagiarism. Software to check originality are also applied. Our clients’ information is highly guarded from third parties to ensure confidentiality is maintained.

24/7 Customer Support

Our support team is available 24 hours, 7 days a week. You can reach the team via live chat, email or phone call. You can always get in touch whenever you need any assistance.

Try it now!

Calculate the price of your order

Total price:

How it works?

Follow these simple steps to get your paper done

Place your order

Fill in the order form and provide all details of your assignment.

Proceed with the payment

Choose the payment system that suits you most.

Receive the final file

Once your paper is ready, we will email it to you.

Our Services

You have had a hectic day, and still need to complete your assignment, yet it is late at night. No need to panic. Place your order with us, retire to bed, and once you wake up, the paper will be ready.


Essay Writing Service

It does not matter the urgency of your paper, or the academic level, our team is ready to help you 24/7. Just contact us and all your academic needs will be sorted.


Admission Essays & Business Writing Help

A student is often required to write an admission letter requesting to be admitted in a certain institution. For you to be gain that admission in your dream institution, you must write a convincing letter. You can depend on our team for the best admission letters.


Editing Support

Academic writing is not just about getting information and throwing it all over. Our team will ensure you have a polished paper that is coherent and has a good flow of information. We also ensure the paper follows the correct formatting styles like APA, Harvard, MLA, Chicago/Turabian.


Revision Support

If our writers write a paper but you are not satisfied in one way or another, you can always ask for revision. This is totally free. Our writers and editors will revise your paper untill you are be totally satisfied. We as well offer revision for papers not done by our writers at a small fee.