如何使用Diffie-Hellman密钥交换来保护客户端和服务器之间的数据传输？

I am a beginner programmer. I have been asked to secure data transfer between a client and a server by using a Diffie-Hellman key exchange. I have searched a lot on this issue, but I have just found some example codes that find big integers I am a beginner programmer. I have been asked t