Tsinghua U.

Non-Malleable Codes

9 years 23 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
Comments (0)