Electrical computers and digital processing systems: support – Data processing protection using cryptography – By stored data protection
Reexamination Certificate
2007-02-13
2007-02-13
Vu, Kim (Department: 2135)
Electrical computers and digital processing systems: support
Data processing protection using cryptography
By stored data protection
C713S162000, C713S189000, C380S201000, C380S264000, C380S268000, C380S277000, C380S044000, C380S046000
Reexamination Certificate
active
09700383
ABSTRACT:
In a method for providing copy-protection services on a storage medium (for instance a solid state memory module), the data are arranged in sectors to which a field (S4T) is associated, where said field contains a random value Riwhich is changed randomly when writing data to said sector. By encrypting the data stored on the medium using a key which depends critically on said random numbers, bit-by-bit copies (apart from said random numbers, which can not be deterministically changed by an application) to a second storage medium or recopies from some intermediate storage medium, can not be decrypted because the values of said random numbers will have changed, thus preventing unauthorized duplication and replay attacks.
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Ijdens Pieter Bas
Jochemsen Robert
Staring Antonius Adriaan Maria
Tol Ronald Marcel
Dada Beemnet W
Harter Secrest & Emery
Salai Esq. Stephen B.
Shaw Esq. Brian B.
Vu Kim
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