6,246 research outputs found
Chosen-Plaintext Cryptanalysis of a Clipped-Neural-Network-Based Chaotic Cipher
In ISNN'04, a novel symmetric cipher was proposed, by combining a chaotic
signal and a clipped neural network (CNN) for encryption. The present paper
analyzes the security of this chaotic cipher against chosen-plaintext attacks,
and points out that this cipher can be broken by a chosen-plaintext attack.
Experimental analyses are given to support the feasibility of the proposed
attack.Comment: LNCS style, 7 pages, 1 figure (6 sub-figures
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CARE: An integrated framework to support continuous, adaptable, reflective evaluation of egovernment systems: A research note
CARE: an Integrated Framework to Support Continuous, Adaptable, Reflective Evaluation of Egovernment SystemsThis is an eGISE network paper. It is motivated by a concern to develop a better approach to learning from the experience of an eGovernment project and applying that knowledge in future projects. The proposed project is based on previous work in the construction industry that developed COLA, a
Cross Organisational Learning Approach. Developing a similar strategy for Knowledge Management is likely to be effective because the ‘silo’ culture of local government organisations has parallels with the segmented organisational structures within the construction industry.Engineering and Physical Sciences Research Council, UK (grant GR/T27020/01
A Note on ODEs from Mirror Symmetry
We give close formulas for the counting functions of rational curves on
complete intersection Calabi-Yau manifolds in terms of special solutions of
generalized hypergeometric differential systems. For the one modulus cases we
derive a differential equation for the Mirror map, which can be viewed as a
generalization of the Schwarzian equation. We also derive a nonlinear seventh
order differential equation which directly governs the instanton corrected
Yukawa coupling.Comment: 24 pages using harvma
Chiral Rings and Physical States in c<1 String Theory
We show how the double cohomology of the String and Felder BRST charges
naturally leads to the ring structure of strings. The chiral ring is a
ring of polynomials in two variables modulo an equivalence relation of the form
for the (p+1,p) model. We also study the states
corresponding to the edges of the conformal grid whose inclusion is crucial for
the closure of the ring. We introduce candidate operators that correspond to
the observables of the matrix models. Their existence is motivated by the
relation of one of the screening operators of the minimal model to the zero
momentum dilaton.Comment: 20 pages, harvmac, 4 figures (drawn using LaTeX appended to the end
of the file), IMSc--92/3
On the Cohomology of the Noncritical -string
We investigate the cohomology structure of a general noncritical
-string. We do this by introducing a new basis in the Hilbert space in
which the BRST operator splits into a ``nested'' sum of nilpotent BRST
operators. We give explicit details for the case . In that case the BRST
operator can be written as the sum of two, mutually anticommuting,
nilpotent BRST operators: . We argue that if one chooses for the
Liouville sector a minimal model then the cohomology of the
operator is closely related to a Virasoro minimal model. In particular,
the special case of a (4,3) unitary minimal model with central charge
leads to a Ising model in the cohomology. Despite all this,
noncritical strings are not identical to noncritical Virasoro strings.Comment: 38 pages, UG-7/93, ITP-SB-93-7
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