Arrays, Strings, and Pointers

Write a C program that breaks a code and decrypts a text message. Suppose we want to encrypt the 7 symbols A,B,C,D,E,F,and G. We map these symbols into the integers 0,1,2,3,4,5,and 6, respectively. The public key U is a positive integer less than 7. The offset F is a positive integer less than 7. To encrypt the symbol represented by integer i, we use this formula: (i * U + F)%7 To decrypt the message, we need to know the private key V. With V, we can use this formula to decrypt the letter i: ((7 + i - F)*V)%7 Private key V is the unique positive integer less than 7 for which U*V%7 = 1. If U=3, then V=5, since 3*5=15, and 15%7=[login to view URL] program should open file "[login to view URL]" and read from it two integers. The first integer is the public key U. The second integer is the offset F. It should break the code by finding the value of the private key V. V is an integer between 1 and 94 such that U*V % 95 = 1. It should open file "[login to view URL]" containing the encrypted message. The program should read a line of text from the file, decrypt the entire line, print the decrypted line to standard output, and repeat until the end of the file is reached. Your program must decyrpt the message line-by-line, rather than character-by-character. Your program should use functions where appropriate. For extra credit, your program should store the entire body of the message in a two-dimensional array of characters. After printing the decrypted message, your program should use the public key to encrypt the message again and print the encrypted message on the screen. The encrypted message your program computes will be identical to the encrypted message stored in file "[login to view URL]". However, you will not receive credit for simply echoing the contents of file "[login to view URL]". Your program must actually encrypt the plain text message ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Installation package that will install the software (in ready-to-run condition) on the platform(s) specified in this bid request. 3) Complete ownership and distribution copyrights to all work purchased. 4) Complete and executable source file (.c file) and project file (.mcp file). ## Platform Codewarrior Version 6.1