Cryptography How do ring signatures work practically? |
- How do ring signatures work practically?
- [Advert] Open PhD & PostDoc positions in Applied Cryptography, Security, and Formal Analysis
- Are cheap board-game dice a good source of random numbers?
- Some questions about Veracrypt
| How do ring signatures work practically? Posted: 27 Mar 2018 03:42 PM PDT As in not the mathematics behind it, but how do the keys work, how many public/private keys are involved and who creates them. I have a reasonable understanding of public and private key crypto already. I'm quite interested in linkable ring signatures, where you can't tell which key was used to sign a message, however you can detect if different messages were signed with the same key. Is that correct? So for example, if we wanted to make a voting system with 5 participants and use linkable ring signatures to detect if someone voted twice. How many keys would be involved, does each participant generate their own keys, Is there a master public key for the group aswell, is anyone in charge of the group? [link] [comments]  |
| [Advert] Open PhD & PostDoc positions in Applied Cryptography, Security, and Formal Analysis Posted: 27 Mar 2018 04:04 AM PDT |
| Are cheap board-game dice a good source of random numbers? Posted: 27 Mar 2018 07:24 AM PDT Created a Diceware password earlier with a handful of cheap dice from board games lying around the house like Monopoly. Read a few pages online about how they are not completely random if they aren't built to a certain quality. Are they better than a pseudorandom number generator? [link] [comments]  |
| Some questions about Veracrypt Posted: 27 Mar 2018 06:14 AM PDT Veracrypt has always been my favourite encryption tool since it came out . But still there are some things about the tool I don't understand . Why is there the possibility to use sha256 or sha512 . This one does not make sense to me at all . As far as I know the output size of the Veracrypt KDF will always have the same length .... so why give the possibility to use a shorter or longer hash ? does it have any advantages ? Why does Veracrypt use such strange hashes ? sha512 , Whirlpool , Streebog , etc ... Whirlpool is ( as far as I know ) not even officially a KDF . All thes hashes are rather collison resistant , but not one of them is suited as cryptographic strong hash function . Why not Argon2 , scrypt , bcrypt , ..? Why is Veracrypt GPU resistant ? Attacking a VC hash with a GPU is slow . Why ? I don't see any GPU attack countermesures . All the hashes are well implemented in GPU . they pass through PIM which ( I think ) rehashes the output of the last hash with the same algo . And then they pass through PBKDF2 at some point . But even PBKDF2 is rather GPU friendly . [link] [comments]  |
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