i and some of my friends created a tool for secure chatting and mail transactions. for this we used a aes 128bit for data confidentiality, Diffie Hellman key exchange algorithm for exhanging data from a central server (key distribution center) and RSA 1024bit for authentication. is there any possiblity of getiing the confidential information during the transaction by packet sniffing attacks. if so tell me how and how to improvise the tool.