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Process for determining a key to scramble radio-phone traffic between a radio-phone terminal and a radio-phone network and radio-phone terminal to scramble signals between radio-phone terminals and a radio-phone network
Process for determining a key to scramble radio-phone traffic between a radio-phone terminal and a radio-phone network and radio-phone terminal to scramble signals between radio-phone terminals and a radio-phone network
A method and apparatus is presented for transforming a key variable used for scrambling cellular data traffic between a terminal and a network in alternate ways using information transmitted to the terminal from the network with which the terminal is connected. Transformation is accomplished by passing portions of the key variable through a series of S-boxes which provide a mapping between the input and output. Moreover, it is disclosed how to save memory by iteratively passing portions of the key variable through the same S-box.
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