For this assignment, write a pair of programs, in C or as shell scripts, to send and receive a message. Your programs will: Send and receive a message by a covert channel on a MINIX 3 system. Hint: A permission bit can be seen even when a file is otherwise inaccessible, and the sleep command or system call is guaranteed to delay for a fixed time, set by its argument. Measure the data rate on an idle system. Create an artificially heavy load by starting up numerous different background processes and measure the data rate again.

The following four requests could come in to an operating system as it is running on a computer system: The clock in the computer has just “ticked,” and we need to update a seconds counter. The program running on processor 2 is trying to perform an illegal operation code. Someone pulled the plug on the power supply, and the system will run out of power in 50 msec. The disk has just read the character that passed under the read/write head, and it wants to store it in memory before the next one arrives. In what order should the operating system handle these requests?

- Let's assume that a system can handle 2,000 users. a UNIX security system that permits 1,990 users to view a single file called "MPX.pdf" is suggested. Do you have any plans for the other ten people who don't have access to the file?

Write a high-security program in C that reads positive integers from a file "/challenge/numbers.txt" in the same directory as the program and outputs the biggest and smallest number.        Input (from numbers.txt):            100            45            12            0            42            922            2        Output:            922            0

For this assignment, you will create a parallel fixed-length code decompressor using the tools we learned in class to create multiple processes and threads. Computers represent a character as a sequence of 8 bits, which means you can represent up to 256 symbols per character. However, depending on the source, it is common to have messages/files using an alphabet with a size of fewer than 256 symbols. The simplest way to achieve compression is to use a fixed-length code generator. The idea behind this type of code generator is to assign a fixed-length bit sequence to each alphabet symbol. Given an alphabet (where each symbol is represented by a character and a decimal value with the code of the symbol), you need to implement a fixed-length code decompressor based on the following steps:   ◦Read the contents of the input file using input redirection (STDIN). The format of the input file is as follow:   - An integer value representing the number of symbols in the alphabet - n lines (where…

Write a program in C to decrypt a cipher text using Caesar Cipher substitution method.Plain text was first encrypted with a Cipher Key within the range 1 to 26 and then encrypted then encrypted with key -1 (minus 1).Find the first key and write the key numbers and the decrypted plain text into text mode file "done.txt" using your program

Write an ARM assembly program to convert temperatures from Celsius to Fahrenheit or from Fahrenheit to Celsius. Here are the two formulas for your reference. Use variable to read and store values, you can initialize any integer value into the variables (Do not expect decimal results we are only doing integer operations). C = 5 × (F − 32) / 9 F = (9 × C / 5) + 32 Name the file TempConvert.s add the below commenting statements in the program ;Name: ;Date: ;Give which expression you use  Please use LDR/STR