Apparatus and storage medium for decrypting information
First Claim
1. In apparatus for retrieving information from a readable storage medium, at least some of which information is stored on said medium in encrypted form and may be decrypted using a decryption algorithm which requires a decryption key, wherein said apparatus comprises:
- (a) a storage medium for storing information;
(b) a control unit for selecting information to be retrieved from said storage medium;
(c) a storage medium reader for reading said selected information from said storage medium; and
(d) a decryption device for decrypting at least portions of said selected information;
said decryption device comprising means for generating a decryption key from first data stored on said storage medium and second data not stored on said storage medium, said second data including initializing data provided to said decryption device for non-volatile storage therein for repeated use by said key generating means.
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Accused Products
Abstract
A system including a storage medium containing encrypted information comprises: (a) a control unit for selecting information to be retrieved from the storage medium; (b) a storage medium reader for reading the selected information from the storage medium; and (c) a decryption device for decrypting at least portions of the selected information using a decryption key. The decryption key is defined, at least in part, by rules and/or data which are read from the storage medium by the storage medium reader. A different and unique key is associated with each separate item or file of encrypted information.
61 Citations
14 Claims
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1. In apparatus for retrieving information from a readable storage medium, at least some of which information is stored on said medium in encrypted form and may be decrypted using a decryption algorithm which requires a decryption key, wherein said apparatus comprises:
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(a) a storage medium for storing information; (b) a control unit for selecting information to be retrieved from said storage medium; (c) a storage medium reader for reading said selected information from said storage medium; and (d) a decryption device for decrypting at least portions of said selected information; said decryption device comprising means for generating a decryption key from first data stored on said storage medium and second data not stored on said storage medium, said second data including initializing data provided to said decryption device for non-volatile storage therein for repeated use by said key generating means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. In apparatus for retrieving information from a readable storage medium, at least some of which information is stored on said medium in encrypted form and may be decrypted using a decryption algorithm which requires a decryption key, wherein said apparatus comprises:
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(a) a storage medium for storing information; (b) a control unit for selecting information to be retrieved from said storage medium; (c) a storage medium reader for reading said selected information from said storage medium; (d) a decryption device for decrypting at least portions of said selected information; and (e) a telephone modem for receiving telephone messages via the telephone network from a remote source, the improvement comprising disabling means, coupled to said telephone modem, for disabling said decryption device from decrypting information upon expiration of a given length of time after receipt of a prior telephone message, unless reset by the receipt of a subsequent telephone message. - View Dependent Claims (14)
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Specification