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Air Max 90 Sale improved key agreement protocol based on
Recently, Xiao et al. proposed an improved key agreement protocol based on chaotic maps, in Air Max 90 Sale which only a predetermined long-term key is utilized to ensure its security. This paper demonstrates that none of these schemes can satisfy the contributory nature of key agreement. To fill the gaps, we present a secure key agreement protocol based on chaotic Hash. The proposed scheme utilizes the chaotic Hash function to achieve the contributory nature and enhance its security. Cryptanalysis demonstrates that our chaotic Hash-based scheme can overcome all the current deficiencies. An effective collision frequency is defined for electrons in gases and its relations to several transport coefficients are derived explicitly, in an attempt to remove confusions arising from different definitions given to the collision frequency in different references. By using the best available data of the momentum-transfer cross section, numerical values are obtained for the effective collision frequencies for a number of atmospheric gases, i.e. for N2, O2, H2, CO2, H2O, O, H and He, over the range of the electron Nike Air Force 1 Trainers temperature from 100 to 5000°K.