Cryptography – Key management – Having particular key generator
Patent
1992-02-27
1995-10-03
Black, Thomas G.
Cryptography
Key management
Having particular key generator
380 4, 380 25, 366DIG1, 3662821, 3662864, G06F 1730
Patent
active
054559413
ABSTRACT:
In storing data in one file, consisting of a plurality of blocks of data, a first code is generated by converting a password and a predetermined portion of each of the blocks of data. This portion may be, for example, the data block itself or identification information such as a name. The code is stored in correspondence to the stored data. In reading the stored data, a second code is generated by performing the same conversion on the password and the predetermined portion of the stored data. A comparison is made between the generated second code and the first code stored. Failure of the two to match indicates that an improper rewrite has occurred. In such a case, that occurrence may simply be noted, access to the data may be prohibited; more generally, what processing is performed, or is permitted, is varied according to the result of the comparison.
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Kurosawa Takahiro
Nagashima Masaaki
Okuno Yasuhiro
Sasaki Takayuki
Yamakawa Tadashi
Amsbury Wayne
Black Thomas G.
Canon Kabushiki Kaisha
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