Data alteration checking apparatus and method and recording...

Details Data alteration checking apparatus and method and recording... Data alteration checking apparatus and method and recording...

2006-07-11

2006-07-11

Zand, Kambiz (Department: 2132)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C713S167000, C713S193000, C380S028000, C380S201000, C380S228000, C705S057000

Reexamination Certificate

active

07076662

ABSTRACT:
MAC values formed with respect to each file belonging to a directory122A and ICVs (D-ICVc) formed on the basis of the MAC values of all files belonging to the directory122A are stored into a sequence page121A. Sequence pages121A,121B, . . . formed respectively with respect to all of directories122A,122B, . . . on a disk and the ICVs formed on the basis of the D-ICVs stored in all of the sequence pages121A,121B, . . . are stored into a sequence block114.Since the MAC values are closed and managed every directory by the sequence pages121A,121B, . . . , a data alteration check can be executed every directory. An alteration check of data recorded on a recording medium can be efficiently performed.

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Patent Abstracts of Japan vol. 2000, No. 13, Feb. 5, 2001 & JP 2000 286839 A (Ricoh Co Ltd), Oct. 13, 2000.

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