Security

Key Reduction of McEliece's Cryptosystem Using List Decoding

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Executive Summary

Different variants of the code-based McEliece cryptosystem were proposed to reduce the size of the public key. All these variants use very structured codes, which open the door to new attacks exploiting the underlying structure. In this paper, the authors show that the dyadic variant can be designed to resist all known attacks. In light of a new study on list decoding algorithms for binary Goppa codes, they explain how to increase the security level for given public keysizes.

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