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Abstract. It is almost a folklore-knowledge that hash-based time-stamping schemes are secure if the underlying hash function is collisionresistant but still no rigorous proofs have...
In the bare public-key model, introduced by Canetti et al. [STOC 2000], it is only assumed that each verifier deposits during a setup phase a public key in a file accessible by a...
Giovanni Di Crescenzo, Giuseppe Persiano, Ivan Vis...