DEVICE AND A METHOD FOR PERFORMING A CRYPTOGRAPHIC FUNCTION
First Claim
1. A method for performing a digital cryptographic function on at least one digital first value and at least one digital second value, said digital cryptographic function having at least one digital result, said method comprising the following steps:
- a) converting the at least one digital first value into at least one analogue first value;
b) converting the at least one digital second value into at least one analogue key value;
c) performing an analogue function on the at least one analogue first value and the at least one analogue key value to give at least one analogue output value; and
d) converting the analogue output value to give a digital output value representing the result of the digital cryptographic function.
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Accused Products
Abstract
The present invention provides a method and an apparatus for encrypting and decrypting digital information while imparting a high level of security on the encrypted digital information. A mixed-mode digital-analogue encryption and decryption technique is proposed, which minimises the probability of an unintended recipient of the thus encrypted information being able to decrypt the information using known reverse engineering techniques.
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Citations
18 Claims
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1. A method for performing a digital cryptographic function on at least one digital first value and at least one digital second value, said digital cryptographic function having at least one digital result, said method comprising the following steps:
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a) converting the at least one digital first value into at least one analogue first value; b) converting the at least one digital second value into at least one analogue key value; c) performing an analogue function on the at least one analogue first value and the at least one analogue key value to give at least one analogue output value; and d) converting the analogue output value to give a digital output value representing the result of the digital cryptographic function. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 18)
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15. A device for performing a digital cryptographic function on at least one digital first value and at least one digital second value, said digital cryptographic function having at least one digital result, said device comprising:
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at least one first digital to analogue converter to convert the at least one digital first value into at least one analogue first value; at least one second digital to analogue converter to convert the at least one digital second value into at least one analogue key value; hardware suitable for realizing an analogue function acting on said analogue first value and said analogue key value to give an analogue result; and at least one analogue to digital converter to convert said analogue result into a digital value to give a digital output value representing the result of the digital cryptographic function. - View Dependent Claims (16, 17)
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Specification