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| pruefungen:hauptstudium:ls13:ppcryptocur-2020-10-21 [21.10.2020 15:08] – Marcel[Inf] | pruefungen:hauptstudium:ls13:ppcryptocur-2020-10-21 [21.10.2020 15:09] (aktuell) – Marcel[Inf] | ||
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| * How does a (non-interactive) signature of knowledge work? How can it be secure without any communication/ | * How does a (non-interactive) signature of knowledge work? How can it be secure without any communication/ | ||
| - | > We often have an interactive protocol that we then transform via the Fiat-Shamir transform. There, we replace the challenges by the verifier (that all need to be public-coin) by hashes of all previous messages. This is then guaranteed to be secure in the ROM. | + | > We often have an interactive protocol that we then transform via the Fiat-Shamir transform. There, we replace the challenges by the verifier (that all need to be public-coin) by hashes of all previous messages. This is then guaranteed to be secure in the ROM. [note: sometimes, we can get a secure scheme with Fiat-Shamir even without the ROM assumption, see https:// |
| * We covered many different privacy-preserving techniques in the lecture: CoinJoin, CoinShuffle, | * We covered many different privacy-preserving techniques in the lecture: CoinJoin, CoinShuffle, | ||