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US 7,461,259 B2Granted
Method and apparatus to provide secure mobile file system
AssigneeNokia Corporation
InventorRam Gopal Lakshmi Narayanan
Life of this patent
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AssigneeNokia Corporation
InventorRam Gopal Lakshmi Narayanan
Estimating the term…
In an exemplary embodiment of this invention there is disclosed a mobile wireless terminal (50) that includes a transceiver (52) for coupling the mobile wireless terminal to a wireless network operator (60), a controller (54) and a memory (56). The memory may be assumed to store a file system program (56A) executable by the controller, and to be operable to store a file having a file data portion (14) for containing file data and a data structure, such as a file header (10), having fields for containing values. A plurality of the fields contain a value of a public cryptographic key (24) associated with a file creator, a seed value (26), an encrypted seed value (28) obtained by encrypting the seed value with a private cryptographic key of the file creator, and a file integrity value (30) obtained using the encrypted seed value and the file data. By the use of the preferred embodiments a file can be traced-back though a plurality of file handlers to a creator of the file.
A method comprising:
A system comprising a file creator configured to create a file, the file creator comprising a unit to obtain a seed value and encrypt the seed value using a private cryptographic key associated with the file creator to form an encrypted seed value;
A file having a representation that is storable in a digital data storage medium, the file comprising a file data portion for storing file data and a data structure comprising fields for storing values, at least one of said fields storing a name of the file, and a plurality of others of said fields storing a value of a public cryptographic key associated with a file creator, a seed value, an encrypted seed value obtained by encrypting the seed value with a private cryptographic key of the file creator, and a file integrity value obtained using the encrypted seed value and the file data.
A digital data storage medium that stores a file comprised of a file data portion for containing file data and a data structure comprising fields for containing values, a plurality of said fields containing a value of a public cryptographic key associated with a file creator, a seed value, an encrypted seed value obtained by encrypting the seed value with a private cryptographic key of the file creator, and a file integrity value obtained using the encrypted seed value and the file data.
An apparatus comprising:
Dependencies are inferred from the claim text.