| 摘要 |
PURPOSE:To use different keys to each storing medium FDi and to improve the security of a storage device by storing identifying names on a recording medium and deciding the keys by using secret parameters. CONSTITUTION:This storage device 1 is constituted of recording medium drives 51-1 and 5a-2 and a device controlling section 2. Plural recording media 6a-1 and 6a-2 are represented as FDi (i=1, 2,...) which respectively have and store identifying names IDi and protective codes Gi. Then keys Ki used for ciphering and deciphering data stored on the recording media 6a-1 and 6a-2 are fixed as Ki=F(SGi, IDi). The S.Gi is SGi=fxALPHA(S,Gi), the F, fx, and S of which respectively represent the key preparing algorithm held by the storage device, internal function of the F, and secret parameter of the F. Therefore, individual keys can be used for the storing media 6a-1 and 6a-2 without using any key management file and the storing content of the storage device can be ciphered and deciphered. |
