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Improved Message Passing Techniques in Fast Correlation Attacks on Stream Ciphers

The fast correlation attack is a general cryptanalytic attack directed at stream ciphers and is related to the decoding of low-density parity-check (LDPC) codes. In this paper, we improve the message passing algorithm by exploiting the fact that the sum of an arbitrary number of initial state variables, called a fixed point, can be written as the sum of only a few other variables. This will result

Parameterization of the COST 2100 MIMO channel model in indoor scenarios

Abstract in Undetermined The COST 2100 MIMO channel model is the latest evolution of the geometry-based stochastic channel models developed by the COST actions. This paper provides a full parameterization of the COST 2100 channel model in four indoor scenarios based on channel measurements conducted in two different buildings. In addition to the parameter values, the meaning and extraction method

Från Columbus till Che. Latinamerikas idéhistoria

Den här boken är tänkt att ge en kort introduktion till några av de viktigaste händelserna inom den ideologiska processen som sträcker sig från det indianska Amerikas tusenåriga kultur, genom spansk och portugisisk kolonialism och till nutidens ”Latinamerika”.

Evaluation of groundwater discharge into surface water by using Radon-222 in the Source Area of the Yellow River, Qinghai-Tibet Plateau

Understanding hydrological processes in the Source Area of the Yellow River (SAYR), Qinghai-Tibet Plateau, is vital for protection and management of groundwater and surface water resources in the region. In situ water measurements of exchange rates between surface water and groundwater are, however, hard to conduct because of the harsh natural conditions of the SAYR. We here present an indirect me