Method and Device for Securely Storing Data and for Accessing Said Data
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United States of America Patent
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Dec 14, 2015
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Dec 17, 2014
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A method for securely storing data on a terminal by means of a portable data carrier, wherein an attribute vector and a master key are deposited on the portable data carrier. The method comprises deriving a key from a predicate and the master key by means of a key derivation function, wherein the predicate is a Boolean function of the attribute vector; encrypting the data with the key; and storing the encrypted data together with the predicate on the terminal. Another method comprises: extracting the predicate from the encrypted data and the predicate; applying the predicate to the attribute vector; and if the attribute vector satisfies the predicate, deriving the key from the predicate and the master key by means of the key derivation function and decrypting the encrypted data.
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