Download e-book for iPad: Information and Communications Security: 9th International by Charalampos Papamanthou, Roberto Tamassia (auth.), Sihan

By Charalampos Papamanthou, Roberto Tamassia (auth.), Sihan Qing, Hideki Imai, Guilin Wang (eds.)

ISBN-10: 354077047X

ISBN-13: 9783540770473

ISBN-10: 3540770488

ISBN-13: 9783540770480

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.

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Additional info for Information and Communications Security: 9th International Conference, ICICS 2007, Zhengzhou, China, December 12-15, 2007. Proceedings

Sample text

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.

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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.)


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