Answered step by step
Verified Expert Solution
Link Copied!

Question

1 Approved Answer

Write a program that reads from the keyboard a small password and then offers two options: 1. enter your name and a filename to save

Write a program that reads from the keyboard a small password and then offers two options: 1. enter your name and a filename to save or 2. enter a file name to load.

With the option 1 proceed to save to the file an encrypted version of your name (details below), with the option 2 proceed to load the information from the file and decrypt the name and print it to the screen.

The options 1 and 2 are in reverse (1 saves the encrypted information to the file, 2 decrypts the information from the file).

Details of the encryption:

Say your name is Andrei and you chose the password 1234, then you do XOR between the ASCII code for A (first letter in your name) and the ASCII code for 1(first letter in your password), I will denote this operation (A,1)

then you do XOR between n and 2 (n,2) (second letter in your name with second letter in password) and so on, thus we will have the following operations to perform:

(A,1) (n,2) (d,3) (r,4) (e,1) (i,2).

Obviously, if you would choose the password qwer then the XOR operations will be between the following pairs:

(A,q)(n,w)(d,e)(r,r)(e,q)(i,w).

The trick is that the encrypted text can be decrypted due to the following property of XOR: A XOR B=C; C XOR B=A, thus if I have the results of the XOR operations in the file (and this is your name encrypted) then it is sufficient to do XOR with the same password (with the same ASCII codes) and I will get back the original string.

For example, with the first password, (A XOR 1) XOR 1 =A, (n XOR 2) XOR 2=n and so on:

((A,1),1) ((n,2),2) ((d,3),3) ((r,4),4) ((e,1),1) ((i,2),2)= A n d r e i. i need it in java please help me.

Step by Step Solution

There are 3 Steps involved in it

Step: 1

blur-text-image

Get Instant Access to Expert-Tailored Solutions

See step-by-step solutions with expert insights and AI powered tools for academic success

Step: 2

blur-text-image

Step: 3

blur-text-image

Ace Your Homework with AI

Get the answers you need in no time with our AI-driven, step-by-step assistance

Get Started

Recommended Textbook for

Current Trends In Database Technology Edbt 2004 Workshops Edbt 2004 Workshops Phd Datax Pim P2panddb And Clustweb Heraklion Crete Greece March 2004 Revised Selected Papers Lncs 3268

Authors: Wolfgang Lindner ,Marco Mesiti ,Can Turker ,Yannis Tzitzikas ,Athena Vakali

2005th Edition

3540233059, 978-3540233053

Students also viewed these Databases questions

Question

2. What potential barriers would you encourage Samuel to avoid?

Answered: 1 week ago