Hi Yang, A couple of comments:
1. The assumption in the draft is that one-step timestamping is not accurate. However, it is basically a question of implementation. It is possible to perform one-step timestamping and to perform constant-latency-encryption/decryption. Furthermore, there are existing products that do exactly that. There are a few academic papers that deal with the accuracy of encrypted PTP, for example see A. Treytl, B. Hirschler, "Securing IEEE 1588 by IPsec tunnels - An analysis". 2. If I understand the goal of this draft correctly, it appears to be presenting the motivation for draft-xu-tictoc-ipsec-security-for-synchronization. If this is indeed the case, you may want to consider integrating the two drafts. BR Tal Mizrahi. From: [email protected] [mailto:[email protected]] On Behalf Of Cui Yang Sent: Wednesday, March 07, 2012 5:35 AM To: [email protected] Subject: [TICTOC] Please Comment on Practical Solutions for Encrypted Synchronization Protocol Hi, all, I have posted a new draft that discusses the practical solutions for encrypted synchronization protocols. Since we have discussed a lot on this problem, and the security requirement of synchronization also noted that confidentiality may need protection, especially in case that the confidentiality protection is mandatory. Synchronization should be available when the traffic is encrypted. The influences by the encryption are explained, and several possible solutions have been discussed. The URL is below, please review and comment. Title : Practical solutions for encrypted synchronization protocol Author(s) : Y. Cui, M. Bhatia, D. Zhang Filename : draft-cui-tictoc-encrypted-synchronization-00.txt Pages : 10 Date : Mar. 1, 2012 This informational document analyzes the accuracy issues with time synchronization protocols when time synchronization packets are encrypted during transmission. In addition, several candidate solutions on such issues are introduced. A URL for this Internet-Draft is: http://datatracker.ietf.org/doc/draft-cui-tictoc-encrypted-synchronization Thanks, Yang ================== Yang Cui, Ph.D. Huawei Technologies [email protected]<mailto:[email protected]>
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