1 Description The project will be implemented as three separate programs. There will be a logger - responsible for logging all activity. There will be an encryption program - responsible for encrypting and decrypting strings. There will be a driver program that will interact with the user to use the encryption program. The entire system will be ran by running the driver program, which will launch the other programs and communicate with them through pipes. If you use C/C++ to code your project you must use the linux system calls fork,pipe, and dup2. If use Java to code your project you must use the Process class. If you use Python use the Subprocess module. Examples for all these approaches will be provided in class. Details of each of the programs are below. 2 Details 2.1 Logger The logger will write log messages to a log file. The log messages are lines of text where the first sequence of non-whitespace characters is considered the action, and the rest of the line is considered the message. The log message will be recorded, with a time stamp in 24 hour notation, in the log file as a single line using the following format: YYYY-MM-DD HH:MM [ACTION] MESSAGE So, the log message "START Logging Started." logged March 2nd, 2022 at 11:32 am would be recorded as: 2022-03-02 11:32 [START] Logging Started. The logger program should accept a single commandline argument - the name of the log file. The logger program will then accept log messages via standard input until it receives "QUIT". 2.2 Encryption Program The encryption program should accept commands given as lines via standard input. The first word (sequence of non-whitespace characters) should be treated as a command, and the rest of the line(after the first space) as the argument for that command. Output is printed to standard out as a line of text where the first word is a response type. The currently set key is remembered by the encryption program. The encryption program should handle the following commands: PASSKEY - Sets the current passkey to use when encrypting or decrypting. ENCRYPT - Using a Vigenre cypher with the current passkey, encrypt the argument and output the result. If no passkey is set output an error. DECRYPT - Using a Vigenre cypher with the current passkey, decrypt the argument and output the result. If no passkey is set output an error. QUIT - Exit the program. The encryption program has the following response types: RESULT - The preceding command succeeded. The rest of the line (after a space) is the result of the executed command. ERROR - The preceding command failed. The rest of the line (after a space) is the error message. More information on the Vigenre cypher can be found at https://en.wikipedia.org/wiki/Vigen%C3%A8re_cipher 2.2.1 Example Interaction Below is a single run of the encryption program. Input: ENCRYPT HELLO Output: ERROR Password not set Input: PASSKEY HELLO Output: RESULT Input: ENCRYPT HELLO Output: RESULT OIWWC 2.3 Driver Program The driver program should accept a single commandline argument the name of the log file. Upon start, the driver program will create two new processes, executing the logger (giving the log file name as a commandline argument) and the encryption program. Pipes should be used to connect to their standard input and standard output. Python and Java provide streams to communicate over these pipes. C/C++ will need to use the read and write system calls to communicate. Once set up, the driver program should print a menu of commands and prompt the user for commands, looping until the quit command is received. Each command should be logged, and the result of each command should also be logged. The start and exit of the driver program should be logged. All strings entered to be encrypted or decrypted should be saved in a history that lasts only for this run. The driver program should accept the following commands. password - Provide the user with the option of using a string in the history or entering a new string. If a new string will be used, prompt the user for a password, and then set it as the current password in the encryption program. If the history will be used, provide the user with a menu where a number can be used to select a string stored in the history. The entered password is not stored in the history. Notice that password is used by the driver and passkey is used by the encryption program. encrypt - Provide the user with the option of using a string in the history or entering a new string. If a new string will be used, prompt the user for a string, record it in the history, and send an encrypt command to the encryption program. If the history will be used, provide the user with a menu where a number can be used to select a string stored in the history. The results should be printed to standard output and saved in the history. decrypt - Provide the user with the option of using a string in the history or entering a new string. If a new string will be used, prompt the user for a string, record it in the history, and send an decrypt command to the encryption program. If the history will be used, provide the user with a menu where a number can be used to select a string stored in the history. The results should be printed to standard output and saved in the history. history - Show the history. quit - Send QUIT to the encryption program and logger, and then exit the program. In the above commands whenever the history is used, provide the user with a means to exit the history and enter a new string. Passwords are never directly logged. Notice that commands to the encryption program are all on one line, but the driver program is more interactive. The command is expected to be inputted separately, and a separate prompt will ask for more information, such as the string to encrypt.