Metin2 encryption

[Gigabyte 0]

I'm wondering what encryption is used to connect and communicate between the client and the server? Global servers, if there's any diffrence

[iltizio 286]

I think there isn't any encryption. It's too old this application and there isn't the necessity to encrypt the connection.

[Gigabyte 0]

There is... I've been digging and there is Diffie Hellman key exchange on top of something else. I'm trying to RE this, the problem i have is i don't really know how to parse the data with the key. The structure is as follows:

"header#UINT8,agreedLength#UINT16,dataLength#UINT16,data#CIPHER_KEY_DATA"

There are 2 keys as the cipher length is 256, one static and one ephemeral i think, might be wrong. So i generate 2 keys myself, send them back in the same structure as the client does, and i get nothing back, which means I've done something wrong somewhere. The cipher key data also looks weird. Any help?

 

Edit: Got the key agreement completed response. Don't know what's next but i'm gonna be looking into it, any help appreciated.