[SOLVED] CS253 Mid Semester Exams

solve Task One with the hint, you will get 20 Points for solving the task, and simultaneously 30 Points will be deducted for taking the hint.

3. To receive a hint, you must write an email to [email protected] along with cc to [email protected] and [email protected] with :

            Subject : CS253 MidSem Hint
            Body :
   

                Name : <Your name>
                Roll Number : <Your Roll Number>
                Hint : <Task number>
   

4. Your total score will not be negative.
5. The window for taking hints opens after the first 30 minutes of the start and closes 30 minutes before the scheduled end of the exam. We will not dis- tribute any hint after 2:30 pm. Depending on the traffic, there may be a delay of up to 5 minutes for us to issue the hint; if you don’t receive the hint in 5 minutes of sending your request, send us a mail immediately.

3 Submission
Overall your submission should be a zipped folder that contains the following files:

1. Your Makefile, along with all the provided assembly code so that simply run- ning make produces the executable.
2. Steps, including all code, you used to figure out your password, and a pass- word.txt file actually containing your password.
3. The file generated by the executable when the correct password was provided.
4. A log file of how you were able to access the secret message, along with a file

   secret.txt containing the text of the actual message.

Instead of multiple logs, you can submit one steps.txt file that contains explanations

for all three tasks together. All your files must be in a folder named

    CS253_MidSem_YourRollNumber

4 Task One

In the downloaded package, you will find multiple pieces of assembly code. You must write a Makefile that stitches together the broken pieces into one executable. In effect, running

$ make

should create the required executable. The assembly files should not be modified in any manner.

Reward: 20 Points.
Hint : You can ask for the build commands in exchange for 30 Points.

Deliverable
For this task you must submit the Makefile you wrote that combines the several

assembly files together into an executable.

5 Task Two

Once you have finished the first task of putting the binary together, you should get an executable. This executable will take two command-line arguments:

1. your IITK roll number.
2. password to retrieve the secret message; your password is your roll number with two of its digits replaced with small-case letters from {a-z}.

In effect, once you have the executable, running a command that looks like this:

$ ./secret 170830 17a80v
with your roll number and the correct password will generate a file containing the

secret message.

Deliverable

For this task you must submit:
• a textfile named “password.txt” containing your password

• any scripts/steps that you used to figure out the password

• the file generated by the executable when the correct password was provided

No external password cracking utility can be used for this. Also, you are not allowed to write any code in languages like C/Java/Python.

6 Task Three

Once you have used the executable to generate the file, you must figure out a way to read the secret message from this file.

Deliverable

For this task you must write down the secret message in a textfile “secret.txt” and a log of how you accessed it.

Live long and Prosper.
[Storyline inspired by the “Star Trek” movies and series]