Cryptography Quiz

Objective

This project will allow you to practice variables, strings, input/output facilities, conditional statements, logical operators, and the Eclipse IDE.

Overview

You will write a very simple application that asks the user to identify how many BITs are on used in certain cryptographic systems or asks the user to identify which kind of cryptographic system uses a certain number of bits for their keys.   For this project, we will assume the following information: Skipjack uses 80 BITs, Rijndael uses 128 BITs, TripleDES uses 168 BITs, and RSA uses 768 BITs.   It's not necessarily the most exciting project, but it's a good place to start doing some more involved coding. Also, if you are curious about cryptography, key-lengths and different algorithms are a place to start exploring (just don't use what you might learn to argue the above assumptions about key lengths).

This project is considered "open". Please visit the course web page for information regarding the open/closed policy for projects of this course.

Specifications

The program begins by prompting the user with:

    Enter 1 to guess a cryptographic system, 2 to guess how many BITs:

The user then enters either "1" or "2".

Processing a choise of "1"

The program prompts the user with:

    Choose number of BITs:

The user must enter either "80", "128", "168", or "768".  If any other number is entered, the program will print out "Invalid choice." and will terminate with no further input or output.

Assuming that the user has entered one of the four valid numbers, the program prompts the user with:

    Which cryptographic system uses n BITs?

[In the prompt above, the n must actually be either "80", "128", "168", or "768"  depending on what the user has selected, and appears as regular text rather than bold and italicized.]

The user will enter a String.  If the String entered represents the correct cryptographic system for the number of BITs selected, the program will output "Correct!" and then terminate normally.  However, if the user has entered the incorrect String, then the program will output "Incorrect!" and then terminate normally.

Processing an Entry of "2"

The program prompts the user with:

    Choose a cryptographic system:

The user must enter either "Skipjack", "Rijndael", "TripleDES" or "RSA".  If any other String is entered, the program will print out "Invalid choice." and will terminate with no further input or output.

Assuming that the user has entered one of the four valid cryptographic systems, the program prompts the user with:

    How many bits used in a CRYPT system?

[In the prompt above, CRYPT must actually be either "Skipjack", "Rijndael", "TripleDES" or "RSA".  depending on what the user has selected, and appears as regular text rather than bold and italicized.]

The user will enter a number.  If the value entered represents the correct number of BITs for the cryptographic system selected, the program will output "Correct!" and then terminate normally.  Howewver, if the user has entered the incorrect value, then the program will output "Incorrect!" and then terminate normally.

Getting Started

In order to help you get started, we have defined a CryptoQuiz class with a main( ) method in a file named CryptoQuiz.java. This file can be retrieved by checking out the project from the CVS repository. Remember that you must have set up your repository in order to check out and submit projects.  Start by going to your CVS repository and checking out project Fall2012Proj1. After checking out the project, when you switch back to the Java perspective, you will see the above files in the "Package Explorer" window, and you will be able to start modifying them.

If you write the project from scratch, without checking out the "Fall2012Proj1" files from your CVS repository, you will NOT be able to submit your work and you will NOT get credit for it.

Requirements

• Your program must use the single class CryptoQuiz.
• You must use "named constants" for any literal values that will not change during program execution. 
• You must use meaningful variable names, good use of whitespace (indentation and blank lines), Java Code Convention placement for braces, and helpful comments.
• Input and output operations must be implemented as demonstrated in class.  (i.e. use the Scanner class for input, and use System.out.print or System.out.println for output.)
• You do not need to worry about the user entering the wrong types of values.  If an integer is expected, assume the user enters an integer; if a String is expected, assume the user enters a String.
• You may assume that the user enters either "1" or "2" (and nothing else) after being asked whether they want to choose a cryptographic system or the number of BITs. They will not enter any other value.
• You should not get creative and modify the project specifications. For example, do not add extra behavior or output.
• We use an automated system to grade projects and you will not pass our tests if you do not follow the project specifications precisely. In particular, you must spell things exactly as we have spelled them and use punctuation EXACTLY as we have.  One missing or incorrect punctuation mark (a period, exclamation point, comma, or colon) could cause you to fail all of the tests.  If you spell something wrong ("TrpileDES" or "Rinjdeal" for example) you will fail many of our tests.  PROOFREAD CAREFULLY.  You do NOT need to worry about how many spaces to put between words in your output -- that won't matter with our tests.  Also, whether or not you capitalize letters doesn't impact out testing of your output.
• Just in case you know what an array is -- you may NOT use arrays (or any Java collections of any kind) while implementing this project.
• Your program must terminate without using anything like System.exit().   (Don't worry if you don't know what that is.)
• Be sure to use ONLY ONE Scanner for your project. If you use more than one Scanner to read from the input stream, you will fail our tests even if it is working fine when you run it on your system!

Sample Runs

The following examples show how your program should behave.  Note that items in italics represent the things that are entered by the user.  Keep in mind these are just examples and NOT the only scenarios that your program is expected to handle. You should test many different input scenarios.

Example 1
Enter 1 to guess a cryptographic system, 2 to guess how many BITs: 1
Choose number of BITs: 3
Invalid choice.
 

Example 2
Enter 1 to guess a cryptographic system, 2 to guess how many BITs: 1
Choose number of BITs: 80
Which cryptographic system uses 80 BITs? Rijndael
Incorrect!
 

Example 3
Enter 1 to guess a cryptographic system, 2 to guess how many BITs: 1
Choose number of BITs: 128
Which cryptographic system uses 128 BITs? Rijndael
Correct!
 

Submission

Submit your project from Eclipse by right-clicking the project folder and selecting "submit".  You may submit as many times as you want -- we we only grade your most recent submission.  After you have submitted your project, you should visit the submit server.  There you can obtain limited feedback about how well your project is performing.  (Choose "release test" to see detailed information.)  The number of times you can run our tests on your project (before the due date) is limited.  The earlier you begin working on the project, the more opportunities you will have to see how your project performs on our tests before the due date!

Grading

There are four public and three release tests which will be run on your project. Please note that some of the release tests will test multiple scenarios. Together, these tests will determine 90% of the grade on the project.  The remaining 10% will be based on your use of correct programming style.

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