Patent ID: 8122262
Filing Date: 2012-02-21
Classification: G06F,Y04S

Abstract:
1. An LSI comprising: an external interface for transmitting and receiving information to and from outside of the LSI; a first key storage section for storing first key information in an un-rewritable state; a second key storage section for storing second key information in a rewritable state; an encryption and decryption processing section for encrypting and decrypting the information which is transmitted or received via the external interface using the first key information or the second key information; a switching section for switching key used by the encryption and decryption processing section between the first key information and the second key information according to the information which is transmitted or received via the external interface; a random number generating and/or acquiring section for generating and/or acquiring random number information; a second key generating section for generating the second key information based on the random number information; and a second key writing section for writing the generated second key information in the second key storage section.