Security issiues in VOIP Applications
This key exchange could be carried out in multiple ways including manually sending the key or through a complex key exchange protocol. After the key exchange process, all the data between the communicating nodes will be encrypted. Even if an attacker gets access to the datagram’s, he/she will not be able decode the data immediately. As the encryption algorithm becomes complex, it becomes harder for the attacker to decode the data within the encrypted datagram. The most likely widespread solution to the network address translation is UDP encapsulation of IPsec. This implementation is supported by the IETF and effectively allows all ESP traffic to traverse the NAT. In tunnel mode, this model wraps the encrypted IPsec packet in a UDP packet with a new IP header and a new UDP header, usually using port 500. Problems arising from VOIPsec There are certain issues associated with VOIP that are not applicable to normal data traffic. Chief among them are latency, jitter, and packet loss. These issues are introduced into the VOIP environment because it is a real time media transfer. In standard data transfer over TCP, if a packet is lost, it can be resent by request. In VOIP, there is no time to do this. Packets must arrive at their destination and they must arrive fast. Solutions to VOIPsec issues Latency: When an end to end encryption is performed in VOIP it (cryptographic engine) introducesthe studies reveals that cryptographic engine as a bottleneck for voice traffic transmitted over IPsec. One proposed solution to the bottlenecking at the routers due to the encryption issues is to handle encryption/decryption solely at the endpoints in the VOIP network [33].Pages: 1 2 3 4 5 6 7 [8] 9 10 11 12 13 14
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