Titlebook: Selected Areas in Cryptography; 14th International W Carlisle Adams,Ali Miri,Michael Wiener Conference proceedings 2007 Springer-Verlag Ber

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Improved Side-Channel Collision Attacks on AES,ntext model. This becomes possible by considering collisions in the S-box layers both for different AES executions and within the same AES run. All the attacks work under the assumption that one-byte collisions are detectable.

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Another Look at Square Roots (and Other Less Common Operations) in Fields of Even Characteristic,We also discuss how to improve the speed of solving quadratic equations. The increase in the time required to perform modular reduction is marginal and does not affect performance adversely. Estimates confirm that the new polynomials mantain their promises. Point halving gets a speed-up of 20% and scalar multiplication is improved by at least 11%.

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Analysis of Countermeasures Against Access Driven Cache Attacks on AES,ndom permutations used in a straightforward manner are not enough to protect against CBAs. Hence, to improve upon the security provided by random permutations, we describe the property a permutation must have in order to prevent the leakage of some key bits through CBAs.

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The Delicate Issues of Addition with Respect to XOR Differences,fied differentials which lead to a related-key rectangle attack which can be applied to 2. weak keys. Our observations are then used to improve a related-key rectangle attack on IDEA by a factor of 2.

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Attacks on the ESA-PSS-04-151 MAC Scheme, key bits can also be recovered. Furthermore, we show that the attacker can find the 60 special key bits as well if he is given, in addition, another set of about 40-50 message/MAC pairs of a special kind with a workload of less than 2. LLL lattice reductions modulo 2. of the same size.

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