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A feasible, secure and collusion-attack-free quantum sealed-bid auctionprotocol is proposed using a modified scheme for multi-party circular quantumkey agreement. In the proposed protocol, the set of all ($n$) bidders isgrouped in to $l$ subsets (sub-circles) in such a way that only the initiator(who prepares the quantum state to be distributed for a particular round ofcommunication and acts as the receiver in that round) is a member of all thesubsets (sub-circles) prepared for a particular round, while any other bidderis part of only a single subset. All $n$ bidders and auctioneer initiate oneround of communication, and each of them prepares $l$ copies of a$\left(r-1\right)$-partite entangled state (one for each sub-circle), where$r=\frac{n}{l}+1$. The efficiency and security\textcolor{blue}{{} }of theproposed protocol are critically analyzed. It is shown that the proposedprotocol is free from the collusion attacks that are possible on the existingschemes of quantum sealed-bid auction. Further, it is observed that thesecurity against collusion attack increases with the increase in $l$, but thatreduces the complexity (number of entangled qubits in each entangled state) ofthe entangled states to be used and that makes the scheme scalable andimplementable with the available technologies. The additional security andscalability is shown to arise due to the use of a circular structure in placeof a complete-graph or tree-type structure used earlier.

Quantum sealed-bid auction using a modified scheme for multiparty circular quantum key agreement