Tsinghua U.

Non-Malleable Codes

13 years 27 days ago
Non-Malleable Codes
We introduce the notion of "non-malleable codes" which relaxes the notion of error-correction and errordetection. Informally, a code is non-malleable if the message contained in a modified codeword is either the original message, or a completely unrelated value. In contrast to error-correction and error-detection, nonmalleability can be achieved for very rich classes of modifications. We construct an efficient code that is non-malleable with respect to modifications that effect each bit of the codeword arbitrarily (i.e. leave it untouched, flip it or set it to either 0 or 1), but independently of the value of the other bits of the codeword. Using the probabilistic method, we also show a very strong and general statement: there exists a non-malleable code for every "small enough" family F of functions via which codewords can be modified. Although this probabilistic method argument does not directly yield efficient constructions, it gives us efficient non-malleable c...
Stefan Dziembowski, Krzysztof Pietrzak, Daniel Wic
Added 02 Mar 2010
Updated 02 Mar 2010
Type Conference
Year 2010
Where ICS
Authors Stefan Dziembowski, Krzysztof Pietrzak, Daniel Wichs
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