| 摘要 |
PROBLEM TO BE SOLVED: To provide a data ciphering system, avoiding the occurrence of a situation where key data for which confidentiality is demanded is read illicitly. SOLUTION: A ciphering data processor is provided with an operation execution unit (2) performing a general-purpose arithmetic processing, a ciphering arithmetic unit (3) performing a ciphering processing, an internal storage device (4) storing ciphering data and key data, to which the cyphering arithmetic unit (3) refers, an internal bus (6) connecting the operation execution unit (2), the cyphering arithmetic unit (3) and the internal storage device (4) and a bus bridge (5) connecting the inner bus (6) to an external bus (10). |
