By Bruce Christianson (auth.), Bruce Christianson, Bruno Crispo, James A. Malcolm, Michael Roe (eds.)

ISBN-10: 3642177727

ISBN-13: 9783642177729

ISBN-10: 3642177735

ISBN-13: 9783642177736

This ebook constitutes the completely refereed post-proceedings of the fifteenth foreign Workshop on safety Protocols, held in Brno, Czech Republic, in April 2007. The 15 revised complete papers awarded including edited transcriptions of a few of the discussions following the displays have gone through a number of rounds of reviewing, revision, and choice. the themes addressed replicate the query "When is a Protocol Broken?" and the way can it degrade gracefully within the face of partly damaged assumptions, or how can it paintings below un(der)specified assumptions.

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Extra info for Security Protocols: 15th International Workshop, Brno, Czech Republic, April 18-20, 2007. Revised Selected Papers

Sample text

There are some obvious limitations of this approach. The first is the cardinality of the possibility set. Directly instantiating the possibility set of even a small 56-bit key is infeasible. The obvious solution is to abstract our models of systems by using reduced size parameters. The size of the possibility set is irrelevant if all we are required to show is that an attack reduces the size of the set faster than a brute-force attack does. The level of simplification required is governed by a particular tool’s ability to work with sets.

The OFB stream is generated by repeatedly encrypting an initial value. The schematic for the ECB|ECB|OFB triple-mode is shown in Figure 1. Let us consider the cryptanalytic attack on this triple-mode of operation, as presented by Biham. Assuming that the block size is 64 bits, by providing the same 64-bit value, v, to all 264 blocks, the two ECB layers would produce the same encrypted value presented to the OFB layer, thereby allowing us to plaintext plaintext plaintext ECB ECB ECB ECB ECB ECB OFB OFB OFB ciphertext ciphertext ciphertext Fig.

Therefore, R needs to decrypt it using its −1 decryption key KR . An incoming authentication test is one in which I receives −1 . Therefore, R needs to sign back v as a function [v]K −1 of the private key KR R it using its private key. 167]; the other −1 ) is used only for signing messages received from I, and it is unseizable key (KR2 by a judge because it is not useful to decrypt any message. I R create v {v, ·}KR1 [v, ·]K −1 verify R2 decrypt v −1 using KR1 sign v −1 using KR2 This resilient authentication test sent to the responder will be successful as long as one of the private keys is not compromised or seized, providing extra assurances for the initiator.

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Security Protocols: 15th International Workshop, Brno, Czech Republic, April 18-20, 2007. Revised Selected Papers by Bruce Christianson (auth.), Bruce Christianson, Bruno Crispo, James A. Malcolm, Michael Roe (eds.)


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