Collisions in the LPS cryptographic hash function of Charles, Goren and Lauter have been found by Zémor and Tillich [16], but it was not clear whether computing preimages was also easy for this hash function. We present a probabilistic polynomial time algorithm solving this problem. Subsequently, we study the Morgenstern hash, an interesting variant of LPS hash, and break this function as well....

Tillich and Zémor proposed a hashing scheme based on the group of unimodular matrices SL2(Fq) over a finite field Fq of q = 2 elements. Charnes and Pieprzyk studied the security of this scheme. They showed that for n = 131 and for some irreducible polynomial P131(x) this scheme is weak. We show that with sufficiently high probability the polynomials Pn(x) can be chosen in such a way that this t...

T o LOOK SACK on our theological past is to see how much christian theologians and philosophers have neglected the exploration of hope. Charles Peguy once suggested that while her two 'sisters', love and faith, were the concern both of medieval and of reformation thought, hope has remained the neglected little sister out in the cold. What has in fact been written on hope in this century has oft...

1 Introduction "S pace" and "place" are familiar words denoting common "Sexperiences. We live in space. There is no space for an-< • / other building on the lot. The Great Plains look spacious. Place is security, space is freedom: we are attached to the one and long for the other. There is no place like home. What is home? It is the old homestead, the old neighborhood, home-town, or motherland....

This paper initially addresses the possibility that expanding human-robot interaction (HRI) – particularly HRI involving humanoid service robots – may increasingly encourage de facto assignment of some measures of moral status to such artifacts. Finding reasons to believe that emergence of a social phenomenon of this kind is plausible, it then examines such assignment from the perspective of a ...

Este trabajo tiene como objetivo comprender cómo los historietas, también llamados cómics, son capaces de manifestar religiosidad, tomando perspectiva la teología cultura Paul Tillich. El principal delimitador del tema propuesto está en actitud marginación e infantilización las lo que ubica un lugar irrelevancia para mirada teológica. Surge entonces pregunta: ¿qué cómics? ¿Son arte? ¿Cuál es su...