Practical Cryptography
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The security of videoconferencing or telephony data transmissions is a very important problem. There are several approaches how to protect communication in general. Videoconferencing or telephony over IP networks is a specific case of security assurance. There are many H.323 clients in the world, no matter whether software or hardware black box. Many of them are closed systems, which are used a lot but with no security. It could be expensive and in some cases complicated to update these clients to provide security functions. This article deals with a relatively cheap, secure and general enough solution of security provision in H.323 networks without need to modify the current H.323 software.