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2020 | OriginalPaper | Chapter

Compact Multi-Party Confidential Transactions

Authors : Jayamine Alupotha, Xavier Boyen, Ernest Foo

Published in: Cryptology and Network Security

Publisher: Springer International Publishing

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Abstract

“Confidential Transactions”, integrated transactions of commitments, signatures, and zero-knowledge range proofs, are favored for their ability to hide transaction amounts. In the real world, multi-party fund transfers are highly desirable for personal and business security. Unfortunately, existing unproven Multi-Party Confidential Transactions are linear in the (exact) number of co-owners; hence they are not compact, very scalable, nor private (leak number of users and their public information). In this study, we provide provably secure private, compact Multi-Party Confidential Transactions, in both the “unanimous” N-out-of-N and “threshold” T-out-of-N settings. Unlike other schemes, our multi-party transactions have the size of single-owner transactions and hide the number of participants. To the best of our knowledge, ours is the first proven secure multi-party and threshold confidential transaction protocol.

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previous chapter Linear Complexity Private Set Intersection for Secure Two-Party Protocols

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Note that we do not specify how the asset details are recorded in the cash system, meaning that the asset details may be permanent like in Bitcoin blockchain or aggregatable in Mimblewimble variants. The confidential transaction protocol is compatible with any secure cash system, which prevents double spending if the unspent assets are accessible.

A wallet is an application that securely stores secret keys. Generally, wallets are password protected.

Multiple wallets with different keys replicate the shadow co-owners of the same owner.

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Title: Compact Multi-Party Confidential Transactions
Authors: Jayamine Alupotha
Xavier Boyen
Ernest Foo
Publisher: Springer International Publishing
Book: Cryptology and Network Security
Print ISBN: 978-3-030-65410-8

Electronic ISBN: 978-3-030-65411-5

Copyright Year: 2020
DOI: https://doi.org/10.1007/978-3-030-65411-5_21

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