[Resource Topic] 2024/1686: Circular Insecure Encryption: from Long Cycles to Short Cycles

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Title:
Circular Insecure Encryption: from Long Cycles to Short Cycles

Authors: Zehou Wu

Abstract:

We prove that the existence of a CPA-secure encryption scheme that is insecure in the presence of key cycles of length n implies the existence of such a scheme for key cycles of any length less than n. Equivalently, if every encryption scheme in a class is n-circular secure and this class is closed under our construction, then every encryption scheme in this class is n'-circular secure for n' > n.

ePrint: https://eprint.iacr.org/2024/1686

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