Comments on: Cryptography and VoIP: A guest article by Hank Cohen http://voipsa.org/blog/2006/06/05/cryptography-and-voip-a-guest-article-by-hank-cohen/ Collective thoughts and musings on the state of VoIP security today. Mon, 06 Oct 2008 19:58:29 +0000 http://wordpress.org/?v=2.6.2 By: Dan York http://voipsa.org/blog/2006/06/05/cryptography-and-voip-a-guest-article-by-hank-cohen/#comment-27378 Dan York Tue, 06 Mar 2007 00:53:00 +0000 http://voipsa.org/blog/2006/06/05/cryptography-and-voip-a-guest-article-by-hank-cohen/#comment-27378 K, Thanks for the comment. I'll have to see if I can ping Hank for a response as he was a guest contributor for only this article back in June 2006. I'm not personally extremely familiar with the DTLS proposal, but my gut reaction may be that it hasn't been considered for media encryption because pretty much most folks in the industry have at this point standardized on SRTP for encrypting RTP. DTLS is in fact one of the proposed protocols under consideration at the IETF meeting in two weeks in Prague to be used for securing the SRTP key exchange between vendors. But again, that is for signaling and not media encryption. Thanks, Dan K,

Thanks for the comment. I’ll have to see if I can ping Hank for a response as he was a guest contributor for only this article back in June 2006. I’m not personally extremely familiar with the DTLS proposal, but my gut reaction may be that it hasn’t been considered for media encryption because pretty much most folks in the industry have at this point standardized on SRTP for encrypting RTP. DTLS is in fact one of the proposed protocols under consideration at the IETF meeting in two weeks in Prague to be used for securing the SRTP key exchange between vendors. But again, that is for signaling and not media encryption.

Thanks,
Dan

]]> By: K Mittal http://voipsa.org/blog/2006/06/05/cryptography-and-voip-a-guest-article-by-hank-cohen/#comment-27369 K Mittal Tue, 06 Mar 2007 00:22:09 +0000 http://voipsa.org/blog/2006/06/05/cryptography-and-voip-a-guest-article-by-hank-cohen/#comment-27369 I found your article very informative. Thanks! One question: why do you only mention DTLS as a possible candidate for signaling security but not for media security? Is the overhead of DTLS too high for encrypting media? I found your article very informative. Thanks!

One question: why do you only mention DTLS as a possible candidate for signaling security but not for media security? Is the overhead of DTLS too high for encrypting media?

]]> By: VOIP Guru http://voipsa.org/blog/2006/06/05/cryptography-and-voip-a-guest-article-by-hank-cohen/#comment-2040 VOIP Guru Sat, 23 Sep 2006 23:45:40 +0000 http://voipsa.org/blog/2006/06/05/cryptography-and-voip-a-guest-article-by-hank-cohen/#comment-2040 Hello, I really like the article in this post. I'm putting a "news" blog together myself using rss feeds and a few articles here and there and I'll put link back to your blog as a resource. Thanks for the info... Hello,

I really like the article in this post. I’m putting a “news” blog together myself using rss feeds and a few articles here and there and I’ll put link back to your blog as a resource.

Thanks for the info…

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