There is recent evidence that we directly map observed actions of other agents onto our own motor repertoire, referred to as direct matching (Iacoboni et al., 1999). This was shown when we are actively engaged in joint action with others' (Sebanz et al. 2003) and also when observing irrelevant movements while executing congruent or incongruent movements (Brass et al., 2000). However, an open qu...

A self-adjoint element in a finite AW*-factor is spectrally symmetric, if its spectral measure under the quasitrace is invariant under the change of variables t 7−→ −t. We show that if A is an AW*-factor of type II1, a self-djoint element in A, without full support, has quasitrace zero, if and only if it can be written as a sum of at most four commuting spectrally symmetric elements. Moreover, ...

This paper presents an interesting application of the Tillich-Zémor function TZ . In particular, we emphasize the concatenation property of this one-way hash function, i.e. TZ(S | T ) = TZ(S) TZ(T ) where S and T are two binary strings. This property is combined with a multisignature scheme in a journalism context. The aim is to authenticate reports or interviews.

for some coefficients ci. Admittedly this definition is not quite all there in that it doesn’t say what the coefficients are. Generally, we take our coefficients in some field. A field is a system of objects with two operations (generally called “addition” and “multiplication”), both of which are commutative and associative, have identities, and are related by the distributive law; also, every ...

BP 1.1 Mon 9:30–10:00 C 243 Chemotaxis and Cell Migration: Sensing and Intracellular Dynamics — •Eberhard Bodenschatz, Carsten Beta, Albert Bae, Gabriel Amselem BP 1.2 Mon 10:00–10:30 C 243 Regulation of Growth during Development: Role of Mechanics — •Lars Hufnagel BP 3.1 Mon 14:00–14:30 C 243 How to Take a Quick Look—Rapid Neural Coding of Visual Information in the Retina — •Tim Gollisch BP 8....

We show that for various choices of the parameters in the SL2(IF2n) hashing scheme, suggested by Tillich and Zémor, messages can be modified without changing the hash value. Moreover, examples of hash functions “with a trapdoor” within this family are given. Due to these weaknesses one should impose at least certain restrictions on the allowed parameter values when using the SL2(IF2n) hashing s...

This paper presents an interesting application of the Tillich-Zémor function TZ . In particular, we emphasize the concatenation property of this one-way hash function, i.e. TZ(S j T ) = TZ(S)TZ(T ) where S and T are two binary strings. This property is combined with a multisignature scheme in a journalism context. The aim is to authenticate reports or interviews.