A wireless communication apparatus may include a first module that stores a first key used to encrypt and decrypt communication contents, a second module that stores a second key used to encrypt and decrypt the first key, the first key being encrypted in accordance with a public key encryption scheme, and a connection bus that connects the first module and the second module to each other Each of the first module and the second module may include an encryption processing unit that encrypts and decrypts information, which is transmitted and received via the connection bus, by using a third key that is different from the first key and the second key.