Transient Quantum Resistance, with Application to Ethereum Consensus

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Candidates for post-quantum migration carry additional costs compared to their pre-quantum counterparts, especially for signatures, and they lose attractive properties of schemes such as BLS: homomorphism, and hence direct signature aggregation. We propose a methodology through which a pre-quantum primitive may still be securely used past Q-day (the advent of quantum computers) in settings where forgery of signatures or cryptographic proofs need only be prevented for a bounded lifespan (trans