Assignment 1-b

Description

What is crack me?

From wikipedia:

• A crackme is a small program designed to test a programmer's reverse engineering skills.

They are programmed by other reversers as a legal way to crack software, since no intellectual property is being infringed upon.

Crackmes, reversemes and keygenmes generally have similar protection schemes and algorithms to those found in proprietary software. However, due to the wide use of packers/protectors in commercial software, many crackmes are actually more difficult as the algorithm is harder to find and track than in commercial software.

What to do?

There are two binaries that you need to get passing outputs.

Specifically, when you run the binary (both binary 1 and 2) with a correct input, it will print out:

"Yes, [your input] is correct!" 

where [your input] is what you provided through a command line argument.

If it is not correct, you will receive,

"No, [your input] is not correct."

Your goal is to get a proper input to get the

"Yes, [your input] is correct!" 

message with your Pin tool.

• You can use any disassembler including IDA.
• You can use debuggers to facilitate your analysis.
• However, your final solution must use Intel Pin.

Restrictions (if you violates the below, your scores will be deducted)

• Do not *remove/skip* instructions/functions/blocks.
• Do not change the program code (i.e., instructions/functions/blocks)
• You are only allowed to change data (i.e., values)

Extra credit

Can you make a pin tool that makes the program print out

"Yes, [your input] is correct!" 

on any inputs.