1,830 research outputs found
Group theory in cryptography
This paper is a guide for the pure mathematician who would like to know more
about cryptography based on group theory. The paper gives a brief overview of
the subject, and provides pointers to good textbooks, key research papers and
recent survey papers in the area.Comment: 25 pages References updated, and a few extra references added. Minor
typographical changes. To appear in Proceedings of Groups St Andrews 2009 in
Bath, U
Cryptanalysis of three matrix-based key establishment protocols
We cryptanalyse a matrix-based key transport protocol due to Baumslag, Camps,
Fine, Rosenberger and Xu from 2006. We also cryptanalyse two recently proposed
matrix-based key agreement protocols, due to Habeeb, Kahrobaei and Shpilrain,
and due to Romanczuk and Ustimenko.Comment: 9 page
High resolution absolute flux profiles of the MC 2 h and k lines in evolved F8 to M5 stars
The central results of a survey of the Mg II resonance line emission in a sample of over 50 evolved late type stars, including spectral-luminosity type F8 to M5 and La to IV are presented. Observed and surface fluxes are derived and correlations noted. The major findings include: (1) Mg II k emission core asymmetry transition near K1 III, analogous to that known for Ca II K; (2) a small gravity and temperature dependence of the Mg II chromospheric radiative loss rate
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