Cryptography and Blowfish are both encryptions used to protect data etc.
Might read up on cryptography?
Cryptography - Wikipedia, the free encyclopedia
Blowfish is simply the game encryption Conquer has chosen to use, however they switched to Cast lately.
Packet Sniff, means you're sniffing packets from the client/server, you need to sniff the packets in order to communicate with the client, because every from server -> client and client -> server is send in packets (bytes) through sockets. Conquer has their packets encrypted (Blowfish) and you need to decrypt them in order to get their structure etc.
Packet analyzer - Wikipedia, the free encyclopedia
Client
Internet socket - Wikipedia, the free encyclopedia