Description
Project description:
In this project, you need to implement a simple encryption and decryption algorithm in ARM assembly. Given a text
message (string) stored in the memory, the encryption program gets the ASCII code of each character and apply one of
the following simple encryption criteria. The encrypted character is stored back in a different location in the memory.
1. Shift left method: shift left ASCII code of each character two bits.
2. Shift right method: shift right ASCII code of each character two bits.
3. Rotate left method: Rotate left ASCII code of each character two bits.
4. Rotate right method: Rotate right ASCII code of each character two bits.
5. Invert the first and the second bits of the ASCII code of each character.
To know which method of the above seven methods you have to use in your project, take the last three digits of your
student ID [(mod 5) +1]. For example, if your student ID is 1190651, then your encryption method is 2 [(651 mod 5)+1 =
1] which is the shift right method.
Everyone has to write two assembly programs; encryption and decryption. The encryption program takes the text
message stored in the memory at specific address and applies the encryption method on every single character and then
stores the encrypted message in a different location in the memory. The decryption program takes the encrypted
message and applies the reverse of the encryption process, which is called the key. For example, if the encryption
method is the rotate left two bits, then its key is to rotate right two bits, and so on.
THE PROJECT IS INDIVIDUAL EFFORT: INSTANCES OF CHEATING/COPYING WILL RESULT IN YOU FAILING THE COURSE.
