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Creators/Authors contains: "Di, Zijing"

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  1. ; ; (, 26th IACR International Conference on Practice and Theory of Public-Key Cryptography)
    Boldyreva, Alexandra; Kolesnikov, Vladimir (Ed.)
    We consider a transform, called Derive-then-Derandomize, that hardens a given signature scheme against randomness failure and implementation error. We prove that it works. We then give a general lemma showing indifferentiability of ShrinkMD, a class of constructions that apply a shrinking output transform to an MD-style hash function. Armed with these tools, we give new proofs for the widely standardized and used $$\EdDSA$$ signature scheme, improving prior work in two ways: (1) we give proofs for the case that the hash function is an MD-style one, reflecting the use of SHA512 in the NIST standard, and (2) we improve the tightness of the reduction so that one has guarantees for group sizes in actual use. 
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