“Anonymous transfer … allows a sender to leak a message anonymously by participating in a public non-anonymous discussion where everyone knows who said what. … The work of [ACM22] presented a lower bound on anonymous transfer, ruling out constructions with strong anonymity guarantees. … They also provided a (heuristic) upper bound, giving a scheme with weak anonymity guarantees. … In this work, we present improved lower bounds on anonymous transfer, that rule out both of the above possibilities.”

Find the paper and full list of authors at the Cryptology ePrint Archive.