SECURE DATA CACHE
First Claim
1. A method of securely caching data stored in an electronic document, the method comprising:
- reading data from said electronic document,using all or part of said data to calculate a unique cryptographic key for said data;
encrypting all or part of said data with said unique cryptographic key;
discarding said unique cryptographic key after encryption; and
caching said encrypted data in a data cache, with decryption of encrypted data requiring the presence of said electronic document to recalculate said unique cryptographic key from said electronic document.
2 Assignments
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Accused Products
Abstract
This invention is generally concerned with methods, apparatus and computer program code for securely caching\data, in particular for caching data stored on smart card systems such as those used in ICAO-compliant EU electronic passports. A caching system for providing a secure data cache for data stored in an electronic document, the comprising: an input to receive data to be cached; a processor configured to use all or part of said received data to calculate a unique cryptographic key for said data; encrypt all or part of said data with said unique cryptographic key; and discard said unique cryptographic key after encryption and an output to send said encrypted data to a data cache, with decryption of encrypted data requiring said unique cryptographic key to be recalculated from said electronic document whereby said data cache is secure. Use of such a cache dramatically speeds up the inspection process, by bypassing the need to read data entirely, except for during the first inspection.
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Citations
20 Claims
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1. A method of securely caching data stored in an electronic document, the method comprising:
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reading data from said electronic document, using all or part of said data to calculate a unique cryptographic key for said data; encrypting all or part of said data with said unique cryptographic key; discarding said unique cryptographic key after encryption; and caching said encrypted data in a data cache, with decryption of encrypted data requiring the presence of said electronic document to recalculate said unique cryptographic key from said electronic document. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A caching system for providing a secure data cache for data stored in an electronic document, the caching system comprising:
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an input to receive data to be cached; a processor configured to use all or part of said received data to calculate a unique cryptographic key for said data; encrypt all or part of said data with said unique cryptographic key; and discard said unique cryptographic key after encryption and an output to send said encrypted data to a data cache, with decryption of encrypted data requiring the presence of said electronic document to recalculate said unique cryptographic key from said electronic document whereby said data cache is secure. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification