Score:0

Could Diffie-Hellman ciphertext be used as OPRF(Oblivious pseudorandom functions) input?

in flag

In my recent PSI project, I wanted to use Diffie-Hellman encryption to obtain ciphertext as OPRF input, but I could not find similar work related to it.

In my opinion, Diffie-Hellman ciphertext length is very long. Is there any performance or security problem if it is used as the input of OPRF?

Geoffroy Couteau avatar
cn flag
An ElGamal ciphertext over a 256-bit curve is only 512 bits long. That's relatively short. I don't think there should be much trouble using a 512-bit string as input to an OPRF (of course, exact performances depend on which OPRF you use).
mangohost

Post an answer

Most people don’t grasp that asking a lot of questions unlocks learning and improves interpersonal bonding. In Alison’s studies, for example, though people could accurately recall how many questions had been asked in their conversations, they didn’t intuit the link between questions and liking. Across four studies, in which participants were engaged in conversations themselves or read transcripts of others’ conversations, people tended not to realize that question asking would influence—or had influenced—the level of amity between the conversationalists.