Question

Create a Python program that uses the UDP protocol and has servers A, B, and C to incorporate the CRC into your three-node program.

A also includes the CRC32 code in the message it sends to B.
B gets both this message and the CRC32 code.
• There is a 40% chance that B will alter the message.
• B transmits the message and the initial CRC32 code to C.
When C receives the message and CRC32 code, it checks to see if it is accurate.

Answer 1

To create a Python program that uses the UDP protocol and incorporates the CRC into a three-node program, you will need to use socket programming and implement the CRC algorithm. Each step of the process is explained in detail.

Step-by-step explanation:

In order to create a Python program that uses the UDP protocol and incorporates CRC into a three-node program, you will need to use socket programming and implement the CRC algorithm. Here is a step-by-step guide:

1. First, import the necessary libraries: socket and binascii.
2. Create sockets for the servers A, B, and C using the socket.socket() function.
3. Bind the sockets to their respective IP addresses and port numbers using the bind() method.
4. Implement the CRC algorithm using the binascii.crc32() function. Add the CRC code to the message to be sent from A to B.
5. Send the message and CRC code from A to B using the sendto() method, specifying the IP address and port number of B.
6. At server B, receive the message and CRC code using the recvfrom() method.
7. Check if the message has been altered by generating the CRC code again using the binascii.crc32() function. Compare it with the received CRC code.
8. If the CRC codes match, forward the message and CRC code to server C using the sendto() method.
9. At server C, receive the message and CRC code using the recvfrom() method.
10. Verify the accuracy of the message by generating the CRC code again and comparing it with the received CRC code.