Hello,there has been some interest in using AES with larger key sizes in Secure RTP, and some implementations have gone in this direction in advance of any specification. I wrote up an internet draft to fill this gap (after trying unsuccessfully to get someone else to write it :-) and to provide usage guidance and (eventually) test vectors. It's online at http://www.ietf.org/internet-drafts/draft-mcgrew-srtp- big-aes-00.txt
I propose that this draft be adopted for standards track, and I ask for your review (if you have an interest in Secure RTP). Please note the "Open Questions" section. The ietf-rtpsec list is copied since this draft is potentially interesting there, even though the draft has little architectural impact.
Best regards, David
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