公开(公告)号：JPH09282111A

公开(公告)日：1997-10-31

申请号：JP9231396

申请日：1996-04-15

Applicant: IBM

Inventor： SAKAKURA TORU ,  SAKAGAMI YOSHINORI

IPC: G06F3/06 ,  G06F3/08 ,  G06F12/00 ,  G06F12/02

Abstract: PROBLEM TO BE SOLVED: To adequately manage logical address-physical address conversion information even in a small-capacity work memory by providing an access control means, a data access means for accessing a data storage part according to an obtained physical sector address, etc. SOLUTION: A microprocessor 10 is a central controller for controlling the whole operation of a device 100 and operates according to program codes stored in a specific area of an internal ROM or flash memory 50. For example, when a host computer sends an access request to the device 100, the microprocessor 10 acquires the contents of commands and the logical address of an access destination by reading the contents of respective registers in an interface circuit 20 and also acquires a physical address according to logical address-physical address conversion information in a work memory 40 to gain physical access to the flash memory 50.

公开(公告)号：JP2000196589A

公开(公告)日：2000-07-14

申请号：JP37235598

申请日：1998-12-28

Applicant: IBM

Inventor： KAMIJO KOICHI ,  MORIMOTO NORISHIGE ,  KOIDE AKIO ,  SAKAKURA TORU

IPC: G09C1/00 ,  G06F12/14 ,  G06F21/24 ,  G06K17/00 ,  G06T1/00 ,  H04L9/32 ,  H04N1/00 ,  H04N1/21 ,  H04N1/32

Abstract: PROBLEM TO BE SOLVED: To provide a digital data authentication system which can prevent data, although having no secrecy themselves, from being altered or passed off owing to improvement or replacement and give security to the data. SOLUTION: Equipment authentication between an input device and a memory device and between the memory device and a receiver is carried out when digital data is written from the input device 100 to the memory device 200 and transferred from the memory device 200 to the receiver 300. At the same time, when the digital data is written to the memory device 200, the digital data is given an electric signature by an unidirectional hash function and when the digital data read out of the memory device 200 and transferred, the given electric signature is decoded and then transferred after it is confirmed that the digital data is not modified after being recorded. Consequently, the data are prevented from being altered or passed off owing to improvement or replacement although the data themselves have no secrecy, so that the data can be given security.