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Enhance research and SIP-based VoIP confidentiality

Author: HongMing
Tutor: HuangMing
School: Yunnan University
Course: Communication and Information System
Keywords: IP Telephony Session Initiation Protocol Encryption Package User Datagram Protocol
CLC: TN916.2
Type: Master's thesis
Year: 2010
Downloads: 52
Quote: 0
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Abstract


VoIP to enter the domestic has more than ten years , quickly With inexpensive, and easy to get recognized , but the SIP protocol for ease of use and flexibility , with a text that is similar to the HTTP protocol , with the characteristics of the cleartext message the confidentiality of the SIP protocol , for the detection of this type of VoIP eavesdropping , attack , interference , restriction , destruction after another, to a large extent affect the normal use of VoIP . Wireshark for research objectives , implementation tools , in order to improve the VoIP confidentiality of SIP-based VoIP analysis and research, packet transform method to strengthen the confidentiality of VoIP analysis tools , Borland C Builder . The work of this paper the following aspects : a VoIP principle research at home and abroad based on a variety of security and confidentiality mechanisms proposed based packet transform strengthen confidentiality . Packet transform method is not only expressly confidential and also hides the protocol information , to protect the privacy of information and the characteristics of the packet , and effective way to avoid eavesdropping and sabotage . The method has the advantages of simple . Second, based on the requirements of packet transform to study the implementation method of the intercepted message , In this paper, the realization of the intermediate driver . Do the filtering at the driver level , no group package , fast , high efficiency ; Secondly , the transmission of packets on the physical network card can be intercepted , to avoid the disadvantage of not be able to get all the packets in the user level . And based on the drive level package technology is mature , high reliability , off-the-shelf modules for program calls. Third, on the basis of the foregoing work requirements and characteristics of the conversion and transmission of packets , this paper, based on C / S structure of the network packet transform and inverse transform . Using C / S architecture model reasonably packet transform task arrangements meet the the ciphertext requirements of Internet transmission to the client and server . After the above processing , the experiment confirmed that the the VoIP confidentiality has been enhanced , the communication quality is guaranteed . Although the realization of this article is the confidentiality of SIP-based VoIP , but due to the handling of IP address - based protection, rather than a specific agreement , the programs of this article did has nothing to do with the protocol , the other non- SIP protocol VoIP can also be carried out effectively confidentiality .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Phone > Telephone lines, telephone network
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