LoginPackets & Encryption

[JBeat]

Hello people, wanna know if any of you have any good link  to understand the packets protocol of lineage 2, im interested in get the rsa key in the first packets exchanged and if have any source code to login, please tell me. :)

im searching too the differences of connection between l2j and official server

thanks :)

[JBeat]

interesting

http://www.maxbastards.gr/forum/index.php?topic=2322.0

[wlifter]

Hello people, wanna know if any of you have any good link  to understand the packets protocol of lineage 2, im interested in get the rsa key in the first packets exchanged and if have any source code to login, please tell me. :)

im searching too the differences of connection between l2j and official server

thanks :)

I am searching the same. I cant understund what is happening but i think at C4 server the RSA key is not sent from server to client but client reads it directly from engine.dll. If i am wrong please correct me someone who knows. Also i cant understand how the client is moded at the new ant-bot systems tha the encryption algorithm of login process is diferent form game servers blowfish.

[JBeat]

i keep searching for information, and this is what i know about connection (i think official is a bit different)

 

-First TCP connection

then

S -------------> C

Init Packet (about 153 bytes- 0x00 to 0x98 ) ,with the  RSA key is contained between (0x09-0x89) length 128 bytes

RSA key only is needed to encrypt login + password.

 

looking a the l2j source code i see this 128 bytes they call them scramble modulus of the rsa key, and i dont have very much knowdelege about criptography, i know rsa key is formed with a modulus and an exponent, but why the server dont send to client the exponent?, and how can i unscramble this modulus? i need a way to reconstruct the public key.

 

any of you know about it ? :S thanks

[wlifter]

wow thanks for the info. Fisrt af all i am talking about C4. I was wondering about this packet. It has length 155bytes and becouse the first 2 bytes are tha packet length that means that maybe the key is 153 bytes length. At l2off server this packet has size 11 so the key is 9 bytes length. I also don't know enought about encrytpion:(

This key is a key fo RSA encryption. So the log in packet is encrypted with RSA and perhaps it is encrypted again with blowfish and then sent to the server.