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Hiding information and signatures in trapdoor knapsacks

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2 Author(s)

The knapsack problem is an NP-complete combinatorial problem that is strongly believed to be computationally difficult to solve in general. Specific instances of this problem that appear very difficult to solve unless one possesses "trapdoor information" used in the design of the problem are demonstrated. Because only the designer can easily solve problems, others can send him information hidden in the solution to the problems without fear that an eavesdropper will be able to extract the information. This approach differs from usual cryptographic systems in that a secret key is not needed. Conversely, only the designer can generate signatures for messages, but anyone can easily check their authenticity.

Published in:

Information Theory, IEEE Transactions on  (Volume:24 ,  Issue: 5 )

Date of Publication:

Sep 1978

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