Algebraic topology--old and new: M.M. Postnikov memorial by Golasiski o.t.v.M., et al. (eds.)

By Golasiski o.t.v.M., et al. (eds.)

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We note that, if the hash function or the extractor are randomized, then the signature will also include the (public) randomness used to evaluate the functions. It is also worth noticing that signatures constructed as above actually achieve the stronger notion of being pseudorandom, and that this even holds if an attacker knows the secret signing key. Instantiations. It remains to specify how to build a “good” hash function and randomness extractor pair. In the random oracle model this is very easy.

This shows that the scheme remains anonymous with respect to full key exposure. Some remarks follow. First, note that our proof actually shows that signatures in our scheme are pseudorandom, even when knowing the signing keys. Clearly, such pseudorandom signatures imply anonymity (with respect to full key exposure), because it is hard to tell such signatures apart from random strings. Second, we can modify our signature scheme to get a strongly unforgeable scheme, given that the starting scheme is strongly unforgeable.

Otherwise, the basic benefits of trusted computing platforms would become meaningless. However, in extreme circumstances, a TPM may be compromised and its keypair exposed, so a verifier should be able to identify the attestation request from rogue TPMs. , EK, E, and s) should be published on the revocation list. For a keypair (E, s) on the revocation list, a verifier checks T1s =? T2 (mod n). If the equation holds, the request comes from a revoked TPM. 24 H. R. 6 Performance Analysis We present a performance analysis of our scheme in the section.

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