Towards a Concrete Security Proof of Courtois, Finiasz and Sendrier Signature Scheme
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- Dallot L. (2008) Towards a Concrete Security Proof of Courtois, Finiasz and Sendrier Signature Scheme. In: Lucks S., Sadeghi AR., Wolf C. (eds) Research in Cryptology. WEWoRC 2007. Lecture Notes in Computer Science, vol 4945. Springer, Berlin, Heidelberg
Courtois, Finiasz and Sendrier proposed in 2001 a practical code-based signature scheme. We give a rigorous security analysis of a modified version of this scheme in the random oracle model. Our reduction involves two problems of coding theory widely considered as difficult, the Goppa Parametrized Bounded Decoding and the Goppa Code Distinguishing.
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