RADIO COMMUNICATION TERMINAL, RADIO BASE STATION, AND COMMUNICATION SYSTEM PROVIDED WITH THEM

摘要

PURPOSE: To provide an attachable/detachable storage device and a radio communication terminal which flexibly and easily copes with new ciphering or the like by the attachable/detachable storage device where ciphering algorithms are stored. CONSTITUTION: An attachable/detachable storage part 115 where plural ciphering algorithms, identifiers corresponding to these ciphering algorithms in 1:1, and a ciphering table showing the correspondence relations between these identifiers and ciphering algorithms are stored is set to a setting part 116 where it can be set without opening the main body cover. An ciphering algorithm is selected by a cipher selection part 110, and voice data is ciphered in a ciphering part 104 based on the arbitrary selected ciphering algorithm to output a cipher text. A cipher data block generation part 105 refers to the ciphering table to read out the identifier corresponding to the selected ciphering algorithm and adds it to the cipher to output a cipher data block.