초록 ▼

A method and apparatus for generating and communicating random challenge values to mobile stations is disclosed that does not lose the unpredictability of a truly random number but can be simply and economically synchronized across cellular systems. The method and apparatus updates a binary number t

A method and apparatus for generating and communicating random challenge values to mobile stations is disclosed that does not lose the unpredictability of a truly random number but can be simply and economically synchronized across cellular systems. The method and apparatus updates a binary number that will be used in cellular telephone system authentication procedures by applying a first algorithm to a plurality of most significant bits of a first binary number to obtain a second binary number; operates on a plurality of least significant bits of the first binary number with a second algorithm to obtain a third binary number, and applies a block cipher to the concatenation of the second and third numbers to obtain the updated binary number. When the most significant bits of the updated binary number comprise an all-zeroes number they are replaced with the most significant bits of the concatenation of the second and third numbers.

대표청구항 ▼

A method and apparatus for generating and communicating random challenge values to mobile stations is disclosed that does not lose the unpredictability of a truly random number but can be simply and economically synchronized across cellular systems. The method and apparatus updates a binary number t

A method and apparatus for generating and communicating random challenge values to mobile stations is disclosed that does not lose the unpredictability of a truly random number but can be simply and economically synchronized across cellular systems. The method and apparatus updates a binary number that will be used in cellular telephone system authentication procedures by applying a first algorithm to a plurality of most significant bits of a first binary number to obtain a second binary number; operates on a plurality of least significant bits of the first binary number with a second algorithm to obtain a third binary number, and applies a block cipher to the concatenation of the second and third numbers to obtain the updated binary number. When the most significant bits of the updated binary number comprise an all-zeroes number they are replaced with the most significant bits of the concatenation of the second and third numbers. tor for each input queue is a predetermined weight factor for the connection associated with the input queue with respect to the other connections which are set up in the network. 8. A network element for use in a teletransmission network, wherein data packets are transferred between a plurality of network elements at a bit rate which depends on available network capacity, said network element comprising; a plurality of input queues in which data packets, when arriving at a network element, are p