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5.2. The Courtois-Finiasz-Sendrier (CFS) Construction

In this session, I am going to present the Courtois-Finiasz-Sendrier Construction of a code-based digital signature. In the previous session, we have seen that it is impossible to hash a document into decodable syndromes. But it is possible to hash onto the space of all syndromes. The document is not always decodable. And we are going to see two techniques to work around this problem. The first technique is to add a counter to the document. This way, we hash both the counter and the document and obtain a hash which is tied to both the document and the ...
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