Radio communication apparatus

摘要

An inexpensive radio communication apparatus is provided which can safely generate and share a key to be used for encryption/decryption and lower the possibility of loss of the key even if a packet error occurs at the time of reestablishment of a radio link. When a request for position registration that is made to a base unit is not a request made by encrypted communication using a common encryption key, the base unit transmits a message to request generation of an initial encryption key, and when a handset correctly responds to the message, both the base unit and the handset store information on the initial encryption key.

主权项

1. A base-unit-side (master-side) radio communication apparatus that performs encrypted communication using a common encryption key with a handset-side (slave-side) radio communication apparatus, the base-unit-side radio communication apparatus comprising:
a radio communication section that establishes a radio link and transmits and receives control data and speech data for telephone call; and an information storage section that stores an encryption key, wherein: when receiving an encrypted-communication activation request including information indicating an encryption key from the handset-side radio communication apparatus after establishing a radio link with the handset-side radio communication apparatus, the radio communication section activates encrypted communication with the handset-side radio communication apparatus in a case where an encryption key corresponding to the received information indicating the encryption key is stored in the information storage section; and when receiving a signal different from the encrypted communication activation request transmitted from the handset-side radio communication apparatus, the radio communication section transmits a signal to request generation of a new common encryption key to the handset-side radio communication apparatus, using an unencrypted signal in a case where the received signal is not encrypted.