ECCC-Report TR21-150https://eccc.weizmann.ac.il/report/2021/150Comments and Revisions published for TR21-150en-usSun, 07 Nov 2021 22:13:16 +0200
Paper TR21-150
| Extractors: Low Entropy Requirements Colliding With Non-Malleability |
Eldon Chung,
Maciej Obremski,
Divesh Aggarwal
https://eccc.weizmann.ac.il/report/2021/150The known constructions of negligible error (non-malleable) two-source extractors can be broadly classified in three categories:
(1) Constructions where one source has min-entropy rate about $1/2$, the other source can have small min-entropy rate, but the extractor doesn't guarantee non-malleability.
(2) Constructions where one source is uniform, and the other can have small min-entropy rate, and the extractor guarantees non-malleability when the uniform source is tampered.
(3) Constructions where both sources have entropy rate very close to $1$ and the extractor guarantees non-malleability against the tampering of both sources.
We introduce a new notion of collision resistant extractors and in using it we obtain a strong two source non-malleable extractor where we require the first source to have $0.8$ entropy rate and the other source can have min-entropy polylogarithmic in the length of the source.
We show how the above extractor can be applied to obtain a non-malleable extractor with output rate $\frac 1 2$, which is optimal. We also show how, by using our extractor and extending the known protocol, one can obtain a privacy amplification secure against memory tampering where the size of the secret output is almost optimal.
Sun, 07 Nov 2021 22:13:16 +0200https://eccc.weizmann.ac.il/report/2021/150