By Charalampos Papamanthou, Roberto Tamassia (auth.), Sihan Qing, Hideki Imai, Guilin Wang (eds.)
This booklet constitutes the refereed court cases of the ninth overseas convention on info and Communications safeguard, ICICS 2007, held in Zhengzhou, China, in December 2007.
The 38 revised complete papers provided have been rigorously reviewed and chosen from 222 submissions. The papers are prepared in topical sections on authentication and key alternate, electronic signatures, functions, watermarking, quickly implementations, utilized cryptography, cryptanalysis, formal research, process safety, and community security.
Read Online or Download Information and Communications Security: 9th International Conference, ICICS 2007, Zhengzhou, China, December 12-15, 2007. Proceedings PDF
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Additional info for Information and Communications Security: 9th International Conference, ICICS 2007, Zhengzhou, China, December 12-15, 2007. Proceedings
Round 2: Ui computes zi+1 = αi+1 y H(αi+1 , IDi+1 ) = g βi+1 (mod p) zi−1 = αi−1 y H(αi−1 , IDi−1 ) = g βi−1 (mod p) βi βi Xi = H (zi+1 )/H (zi−1 ) (mod p) βi n n−2 ) · Xin−1 · Xi+1 · · · Xi−2 Each Ui broadcasts Xi . Ui computes Ki = H (zi−1 (mod p). Then each user Ui in the group outputs “accept” if they hold a common shared key. All the steps of the SH are ﬁnished, and the handshake has been successful. To see that this scheme is sound, let: βi ) = H (g βi−1 βi ) (mod p) Ci−1 = H (zi−1 βi Ci = H (zi−1 ) · Xi = H (g βi βi+1 ) Ci+1 = H ··· βi (zi−1 ) (mod p) · Xi · Xi+1 = H (g βi+1 βi+2 ) (mod p) βi Ci−2 = H (zi−1 ) · Xi · Xi+1 · · · Xi−2 = H (g βi−2 βi−1 ) (mod p) It is obvious that βi n n−2 Ki = Ci−1 Ci Ci+1 · · · Ci−2 = H (zi−1 ) · Xin−1 · Xi+1 · · · Xi−2 = H (g β1 β2 ) · H (g β2 β3 ) · · · H (g βn β1 ) (mod p) 30 L.
NPAKE+ : A Hierarchical Group PAKE Protocol Using Diﬀerent Passwords 41 In the nPAKE+ protocol, the group key computation is closely related to tree structure. By default, the key tree is formed to be a balanced binary tree to reduce the computation cost to minimal. Alternatively, the ﬁrst client (the initiator) or the server can decide the tree structure. This key structure information should be protected from manipulation. Either it is agreed upon via an out-of-band channel, or it is authenticated during the protocol.
Moreover, compromise of any client leads to breakdown of the entire system. Secondly, individual client identiﬁcation is impossible in this setting. As a result, no one is able to distinguish one client from another, and it is impossible for a subset of the group to securely establish a session key and hence have secure communications. It is easy to see that the independent-password setting avoids the above problems and reﬂects more accurately what is happening in the real world. S. Qing, H. Imai, and G.
Information and Communications Security: 9th International Conference, ICICS 2007, Zhengzhou, China, December 12-15, 2007. Proceedings by Charalampos Papamanthou, Roberto Tamassia (auth.), Sihan Qing, Hideki Imai, Guilin Wang (eds.)