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You are working for a cryptography department, where one of your jobs is to decipher intercepted messages that have been encrypted using a book cipher. The messages are sent by different people, each of whom writes their plaintext in a different language to confuse any attempt to decipher the messages. But this has made them a little too confident, and you have discovered a very useful secret: unaware that their messages can be cracked, each sender tends to use the same book passage over and over; all that changes is where in that passage they start the encryption. Being very lazy, they always start the encryption within 20 letters of the start of the passage. So for the purposes of this task, the 'key' is simply the starting position in the book text, and is a number from 0 to 20. Your job now is to write a computer program (a real executable program, not a spreadsheet) that can be used to decrypt these intercepted messages. The program will be required to read the ciphertext from a file and to display the plaintext on the screen, along with the key that was used to encrypt it. You will be asked to demonstrate your program to the tutor in the lab class on the due date. This is so that you will be there to run the program and make any decisions that need making. You will be given several ciphertexts to practice on, but in the demonstration you will be asked to demonstrate your program on files you have not seen. You may write your program in whatever programming language you wish.
Return a new picture with each pixel''s color values made up of 80% of the color values of the corresponding pixel in the first picture and 20% of the color values of the
Assume that you are a college professor needing to average grades for 10 students. Write a program that asks for each student's name and grade. Print the list on-screen with each s
( Airline Reservations System ) A small airline has just purchased a computer for its new automated reservations system. You have been asked to develop the new system. You are to w
What is a genotype of parents
Most popular news websites publish their RSS ( Really Simple Syndication ) feeds. If you haven 't heard of RSS, you may have a look at this article on Wikipedia. In this assignm
Below is an example of an invalid XHTML page. Your goal is to rewrite the code so that: No deprecated/obsolete tags are being used All elements are nested correctly (i.e
i neeed an CGI Script that send mass emails i need this input fields Sender Name: Sender Email: Subject: Message: choose (HTML Or text ) , by default HTML Emails and send bu
Write your own version of the strcmp function string_compare. Supply a main program that will test each of the 3 differing outcomes. int string_compare(char *s, cha
Need help with a cobol program.
hello there, I making a program for the collage but I got stuck at one point, I have a timmer that moves object pnl with the pnl.left function, but I want it when it gets to end of
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