Radio communication terminal, radio base station, and communication system provided with them

TLDR: In this paper, an attachable/detachable storage device and a radio communication terminal which flexibly and easily copes with new ciphering or the like by the attachable and detachable storage devices where ciphering algorithms are stored is provided.

Abstract: 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.