Part 6/13:
The game's encryption routines, while labeled as such, do not provide robust security. XOR encryption (or XOR cipher) is a simple operation easily reversible if the key or pattern is known. Moreover, the functions assume the buffer's size is a multiple of four bytes, and any leftover bytes might not be encrypted properly, creating further vulnerabilities.
Network reception functions decrypt inbound UDP packets, then verify their integrity using CRC checks—a common method to detect errors and validate data authenticity. The CRC used is a straightforward cyclical redundancy check, matching the data payload with an appended checksum to ensure integrity and proper protocol adherence.