Applied Cryptography and Network Security: 5th International by Qiong Huang, Duncan S. Wong, Yiming Zhao (auth.), Jonathan

By Qiong Huang, Duncan S. Wong, Yiming Zhao (auth.), Jonathan Katz, Moti Yung (eds.)

This booklet constitutes the refereed complaints of the fifth foreign convention on utilized Cryptography and community safety, ACNS 2007, held in Zhuhai, China, in June 2007.

The 31 revised complete papers offered have been rigorously reviewed and chosen from round 260 submissions. The papers are equipped in topical sections on signature schemes, desktop and community defense, cryptanalysis, group-oriented defense, cryptographic protocols, nameless authentication, identity-based cryptography, protection in instant, ad-hoc, and peer-to-peer networks, in addition to effective implementation.

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Extra info for Applied Cryptography and Network Security: 5th International Conference, ACNS 2007, Zhuhai, China, June 5-8, 2007. Proceedings

Sample text

Then we compute SigTi,ji +1 step-by-step each time we advance one leaf in tree Ti,ji . The generation of SigTi,ji +1 is completed if li = 2hi − 1. Lemma 4. On average, we require csig (i) = (2wi−1 −1)twi−1 2hi +1 cHash + twi−1 +1 2hi cPrng (8) operations each time we advance one leaf in Ti,ji to compute SigTi,ji +1 . Proof. The one-time signature SigTi,ji +1 is generated using the Winternitz parameter of layer i − 1 (wi−1 ), and on average requires (2wi−1 − 1)twi−1 /2 hash evaluations and twi−1 + 1 calls to the PRNG, see Lemma 3.

Treehash Input: Leaf l, stack S Output: updated stack S 1. push l to S 2. 1. 2. push H(n2 ||n1 ) to S 3. return S Next, the roots RootTi,1 and authentication paths AuthTi,1 ,0 of of the succeeding trees Ti,1 , i = 2, . . , T are computed with Algorithm 1. As explained above, the initial seeds SeedTi,1 ,0 related to the trees Ti,1 are now available. Finally, after generating the second tree in each layer, the seeds SeedTi,2 ,0 are available, which are stored as part of the private key to allow an efficient generation of trees Ti,2 during the signing process.

Message Flow for SSL/TLS compute RootT RootT correct? false reject true accept Merkle Signatures with Virtually Unlimited Signature Capacity 43 that he receives from the server, and compares the root of the top tree to the server’s public key. In the final step, the server sends Sigd to the client who verifies its correctness. The overhead of our protocol for the server is just 2n bits memory to store RootTT ,jT and lT −1 . The benefits are as follows: it minimizes bandwidth and server-side calculations in case of DoS attacks, and optimizes the latency of the transaction.

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